No subject
Fri Feb 8 15:06:04 EST 2008
snippet at the bottom of Section 4 about gdaltindex and creating a tile
index shapefile. I tried that. =20
Here's what I typed: gdaltindex u_of_ill.shp
~/Desktop/UofImapSquares/*.gif
Here's what was returned to me:
It appears no georeferencing is available for
`/home/jimbo/Desktop/UofImapSquares/A0.gif', skipping.
It appears no georeferencing is available for
`/home/jimbo/Desktop/UofImapSquares/A12.gif', skipping.
and so on.........
Ok. Yes. I know. There's no georeferencing info attached.
But, how do I go about attaching georeferencing info? =20
And how do I create, edit, and view a shapefile?
And lastly, do I need a world file to determine a global position for
every tile?
I tried using a text editor Gedit (I figured What the Hey?) to open them
and nope - wasn't in UTF-8 encoding.
I did some digging Google and noticed that you can use ArcView GIS,
ArcMap, ArcGIS, and ArcCatalog to create, edit, and view shapefiles.
I also stumbled across posting that talked about ShapeLib created by
Eduardo Patto Kanegae and maintained by Frank Warmerdam.
I don't have money to spend on buying some GIS program, and ShapeLib
seems like the answer.
Could anyone help?
- Chris
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<body lang=3DEN-US link=3Dblue vlink=3Dblue>
<div class=3DSection1>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Chris =
–<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>(I added the list back to the reply =
line –
please always reply to the whole list – =
thanks)<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>A world file is in the units of the =
image’s
projection, not the other way around. Having a world file does not =
mean
the image is in UTM projection. The UTM projection is a popular =
one, but
it’s certainly not the only one. For a map in Illinois UTM =
is
certainly a possibility, but an Illinois State Plane Coordinate System
projection is also a possibility – especially if the original =
imagery
came from the State of Illinois. And geographic lat/lon =
coordinates are
also a possibility due to the increasing number of people in the world =
who seem
to think the Earth is flat (at least on the =
Web).<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I don’t know which campus =
you’re
using, but if you’re at UIUC then the UTM coordinates will be in =
UTM Zone
16 with values of around 395000 (X or Easting) 4440000 (Y or =
Northing).
If your numbers don’t look like those, they’re not =
UTM.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Oh, sorry – I started =
answering
before reading all the questions, and you later seem to confirm that =
your
coordinates are indeed UTM. But you got the formulas backwards, =
and X
should be positive while Y should be negative- not the other way =
around.
And the measurements in your world file are indeed in meters, but =
that’s
because those are the native units of the UTM projection being =
used.
There’s nothing that requires them to be in meters; many =
<st1:country-region
w:st=3D"on"><st1:place w:st=3D"on">US</st1:place></st1:country-region> =
state plane
coordinate systems use units of feet, and those would appear in the =
world file,
too.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Now it is highly unlikely that your =
pixel
resolution is different in each dimension. You could average those =
two
numbers, or double-check your coordinate values (you didn’t say =
what
source you used to get them). If you got this image from a GIS =
source, I
would say that if you think the dimensions are different you’re =
wrong,
but who knows what the University did to munge the image into a pretty
picture. So maybe the dimensions ARE different; that’s not
impossible, just odd. I still would double-check your measurements =
and
math, but if you get the same answer that’s =
OK.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Once you do that you just have to =
crank
out those world files!<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'margin-left:33.0pt;text-indent:-.25in;mso-list:l0 level1 =
lfo1'><![if !supportLists]><font
size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;
color:navy'><span style=3D'mso-list:Ignore'>-<font size=3D1 =
face=3D"Times New Roman"><span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></font></span></span></font><![endif]><font size=3D2 color=3Dnavy
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Ed<o:p></o:p></sp=
an></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Ed =
McNierney<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>TopoZone.com<o:p></o:p></span></font=
></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>
<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>
</span></font></div>
<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> =
Christopher
Harris [mailto:docterrobert at msn.com] <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, =
September 26,
2007 1:13 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> Ed McNierney<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: =
[UMN_MAPSERVER-USERS]
Rasters, TileIndex and Shapefiles - Oh My! Really =
Confused</span></font><o:p></o:p></p>
</div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'>Wow. Thanks Ed. You went to a lot of
trouble. Most of this stuff you've explained I have a handle =
on. I
wikipedia'd how to make a world file when I did that previous app. =
And
yes, it's the same app with the image that's in UTM projection. I
actually have one last question about that, but I'll do a separate post =
for
that. This is a modification of that app. See, I've been =
using this
"Parking Lot" map for the <st1:place =
w:st=3D"on"><st1:PlaceType w:st=3D"on">University</st1:PlaceType>
of <st1:PlaceName w:st=3D"on">Illinois</st1:PlaceName></st1:place>, =
because I
couldn't find a better looking one. Well, yesterday, I noticed =
that you
could go their full campus map and right click on each individual tile =
and save
it as a .gif. I had tried this before but was apparently clicking =
on
certain, wrong areas of each tile every time where I guess the =
javascript was
blocking me. The javascript that they use displays info on certain
buildings when you click on them. If you happen to right-click on =
or
around a building and try to save, you can't. You have to click =
somewhere
else on the tile that's on or around a building. Anywho - my boss =
now
wants me to take what I've done with that one pic of the =
"Parking
Lot" and now apply it to a big tiled image of the entire campus =
(enter the
tiles I've saved). That's the back story as to what's going =
on.<br>
<br>
I have 3 questions now.<br>
<br>
#1 You asked if the image is in UTM. I'm basing the image =
projection on
the world file. I remember you (or maybe this one other guy on =
this list
serv) telling me before that you can't distinguish what projection a =
world file
is in - that that's one of the cons to world files. Every example =
I've
ever seen after typing in "World File" in Google shows a world =
file
that is in meters and says that it's using UTM projection. That's =
still
the case right?<br>
<br>
Oh, the lat/lon has to do with me reprojecting. See, someone =
passes me a
lat/lon coordinate (a center point). I then take that, and convert =
it to
UTM, because the map's projection is in UTM due to the world file being =
in UTM.<br>
<br>
Thanks for your time and patience by the way. You've been a huge =
help.<br>
<br>
#2 The one thing I'm hazy on in regard to the world file is: <br>
the 1st and 4th line - pixel size in the <i><span =
style=3D'font-style:italic'>x</span></i>-direction
and y-direction in map units/pixel<br>
<br>
I understand why x is positive and y is almost always negative. =
But, does
that mean, for example, <br>
if I type 2 for the 1st line and -2 for the fourth line, then there will =
be 2
meters per pixel going both directions? For that I could never =
find an
example of what they meant. I just assumed that. I usually =
work
best with seeing an example, and one was never provided on any of the =
pages I
visited.<br>
<br>
#3 </span></font><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>"The X pixel dimension will be =
(maxx
– minx) / xpixels, and the Y will be (miny – maxy) / =
ypixels.
You should find that the X number is -1 times the Y number."<br>
</span></font><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial;color:black'><br>
Is pixel dimension related to question #2? For instance (in =
meters):<br>
<br>
TL - 393898 4441379 BR - 396253 4438945</span></font><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'><br>
</span></font><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial;color:black'><br>
maxx=3D393898, maxy=3D4441379<br>
minx=3D396253, miny=3D4438945<br>
<br>
DeltaX=3D-2355, DeltaY=3D2434<br>
<br>
Say the mosaic's dimensions in pixels are.........: X=3D1500, =
Y=3D2000<br>
<br>
X pixel dimension =3D -2355/1500 =3D -1.57 meters/pixel<br>
Y pixel dimension =3D 2434/2000 =3D 1.217 meters/pixel<br>
<br>
That right?<br>
<br>
- Chris</span></font><font size=3D2 face=3DTahoma><span =
style=3D'font-size:
10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>
<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'>
<hr size=3D2 width=3D"100%" align=3Dcenter>
</span></font></div>
<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>Subject: RE: =
[UMN_MAPSERVER-USERS]
Rasters, TileIndex and Shapefiles - Oh My! Really Confused<br>
Date: Wed, 26 Sep 2007 14:45:54 -0400<br>
From: ed at topozone.com<br>
To: docterrobert at MSN.COM; =
MAPSERVER-USERS at LISTS.UMN.EDU<o:p></o:p></span></font></p>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Chris –</span></font><font =
size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>OK – it’s not as bad as =
all
that – don’t fire up Photoshop yet. If you have a set =
of
tiles which together create a seamless large image, and those tiles are =
of a
regular size and shape, don’t bother pasting them =
together.</span></font><font
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Each world file has six numbers in =
it, two
of which will be 0. For each image tile you need a world file that
contains the X/Y coordinates of the upper left pixel of the image (two
numbers), and the dimension (size) of each pixel in X (one number) and Y =
(one
number) units. In the vast majority of cases the last two numbers =
will be
identical except for sign (the Y value is normally a negative number =
since Y
values decrease as you go from the top to the bottom of the =
image).</span></font><font
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>If your images make a rectangle =
when
pasted together, just treat them as one. Find the X/Y coordinates =
of the
upper left corner of the entire image area, and the X/Y coordinates of =
the
lower right corner of the entire image area. Find the size of the =
entire
mosaiced rectangle in X and Y pixels. The X pixel dimension will =
be (maxx
– minx) / xpixels, and the Y will be (miny – maxy) / =
ypixels.
You should find that the X number is -1 times the Y =
number.</span></font><font
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>For all your world files, these two =
X and
Y extent values (the first and fourth lines) will be constants. =
The last
two lines are the upper left X and Y coordinates of each tile. =
Your tiles
will all have the same Y value across each row, and the same X value =
down each
column. You know what the upper-left corner of the upper-left tile =
is,
because you measured it. You know the number of X pixels in each =
tile and
the number of Y pixels in each tile, and you now know the size in X and =
Y units
of each pixel, so you know the extent of each image tile in X and Y =
units, so
you can calculate the upper-left corner coordinate of the image to the =
right
and the image below. Repeat until complete.</span></font><font =
size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>All your measurements need to be =
done in
the units of the image’s coordinate system. Is this the =
image you
were asking about earlier that’s in UTM projection? If so, =
you need
UTM coordinates, NOT lat/lon. I wouldn’t recommend Google =
Earth as
a very accurate way to do that, but if it’s close enough for you =
and easy
that’s OK. If you can easily find the corners of your image =
area on
a topo map you can do it on TopoZone and get UTM coordinates accurate to =
within
a few meters just by clicking on the spots that match the corner points =
of your
image.</span></font><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'><o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>If there isn’t an obvious =
landmark
at the corner, you can pick a prominent location NEAR the corner and =
just
measure the number of pixels away from the corner it is. =
It’s just
a bit more bookkeeping but does the same thing.</span></font><font =
size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal =
style=3D'margin-left:33.0pt;text-indent:-.25in'><font size=3D2
color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;
color:navy'>-</span></font><font size=3D1 color=3Dnavy><span =
style=3D'font-size-adjust: none;
font-stretch: normal'><span =
style=3D'font-size:7.0pt;color:navy'> =
</span></span></font><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Ed</span></font><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Ed McNierney</span></font><font =
size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>TopoZone.com</span></font><font =
size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<div>
<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>
<hr size=3D2 width=3D"100%" align=3Dcenter>
</span></font></div>
<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> UMN =
MapServer
Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] <b><span =
style=3D'font-weight:
bold'>On Behalf Of </span></b>Christopher Harris<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, =
September 26,
2007 11:15 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
MAPSERVER-USERS at LISTS.UMN.EDU<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: =
[UMN_MAPSERVER-USERS]
Rasters, TileIndex and Shapefiles - Oh My! Really =
Confused<o:p></o:p></span></font></p>
</div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> </span></font><font size=3D2 face=3DTahoma><span =
style=3D'font-size:
10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'>Thanks again, Ed. I need to clear up some =
things that
I guess I didn't make clear.<br>
<br>
I know that a world file provides georeferencing. I meant to say =
that I
had a .gif that had no georeferencing info associated with it, and then =
added
one. From there I got my initial app to work (displaying the big =
map).<br>
<br>
One thing I omitted was that the little .gifs (tiles), when assembled, =
make up
a different big map pic then the one where mentioned =
:<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>“</span></font><font size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'>it =
uses one .gif
(the big map pic), attaches the big map to the globe via a world =
file.
That big map .gif had no georeferencing info attached to =
it."<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'>Before I had a pic of a large section of a college
campus. Now I have a pic of the entire campus, but in little =
tiles.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'>I know Mapserver makes maps and not pics too. =
I probably
just worded something wrong.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>"So – what do you know =
about
these images? Do you really have a world file that correctly =
describes
your big GIF image? Do you know exactly how the little images were
created from the big image? If so, you should be able to figure =
out how
to generate world files for each individual image. If not, =
you’ll
need to get that information for your big image."<br>
<br>
</span></font><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial;color:black'>Yes, I have a world file, but it's for =
the pic
that shows a large section of the campus - not for the big pic that is =
the sum
of the little pics.<br>
<br>
<br>
Ok, so then I have to have a world file for every little tile, but =
before that
I need to correctly set up the world file for the big pic, which I guess =
I'll
need to assemble in Photoshop. Does that sound right? I can =
do it,
it's just a bit tedious lining up the tiles and such. Also, how do =
you
correctly align a pic of some map on the globe. I've been using =
Google
Maps to do it. I'll sit there and study where the pic's corners =
should
approximately be, then get the lat/lon from that (clicking directions to =
or
from will yield the lat/lons).<br>
<br>
Thank you.<br>
<br>
- Chris </span></font><font size=3D2 face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'> =
<o:p></o:p></span></font></p>
<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'>
<hr size=3D2 width=3D"100%" align=3Dcenter>
</span></font></div>
<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>Subject: RE: =
[UMN_MAPSERVER-USERS]
Rasters, TileIndex and Shapefiles - Oh My! Really Confused<br>
Date: Wed, 26 Sep 2007 13:36:42 -0400<br>
From: ed at topozone.com<br>
To: docterrobert at MSN.COM; =
MAPSERVER-USERS at LISTS.UMN.EDU<o:p></o:p></span></font></p>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Chris –</span></font><font =
size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Let me suggest you try to get =
unconfused
just one step at a time!</span></font><font size=3D2 face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>“</span></font><font size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'>it =
uses one .gif
(the big map pic), attaches the big map to the globe via a world =
file. That
big map .gif had no georeferencing info attached to =
it.”<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'> <o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>That’s a bit of a
contradiction. A world file is one way of providing =
georeferencing.
If you’ve got an image “attached” to the Earth via a =
world
file, you’ve georeferenced it.</span></font><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>MapServer makes maps, not =
pictures.
One of the chief differences is that a map has geographic location =
information
associated with it. When you ask MapServer to generate a map for =
you, you
need to tell it the location of the map you want in some coordinate
system. In order for MapServer to know which of your GIF images to =
use in
making the output map, it needs to know the geographic location of each =
of
those images. Otherwise it couldn’t figure out which ones to =
use.</span></font><font
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>A TILEINDEX is step two in the
process. Once you have a set of more than 1 properly georeferenced =
images
that you’d like to use like a single logical image, you can create =
a
TILEINDEX to do that. But you have to completely and correctly =
make it
through step one first. Once you get the individual images =
properly
georeferenced, gdaltindex will just work.</span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>So – what do you know about =
these
images? Do you really have a world file that correctly describes =
your big
GIF image? Do you know exactly how the little images were created =
from
the big image? If so, you should be able to figure out how to =
generate
world files for each individual image. If not, you’ll need =
to get
that information for your big image.</span></font><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>If you do have that world file and =
know
how the tiles were created, let us know (you can post the world file in =
your
reply – it’s just six lines of text).</span></font><font =
size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal =
style=3D'margin-left:33.0pt;text-indent:-.25in'><font size=3D2
color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;
color:navy'>-</span></font><font size=3D1 color=3Dnavy =
face=3DTahoma><span
style=3D'font-size:7.0pt;font-family:Tahoma;color:navy'>  =
;
</span></font><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial;color:navy'>Ed</span></font><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Ed McNierney</span></font><font =
size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>TopoZone.com</span></font><font =
size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><font size=3D2
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></=
p>
<div>
<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>
<hr size=3D2 width=3D"100%" align=3Dcenter>
</span></font></div>
<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> UMN =
MapServer
Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] <b><span =
style=3D'font-weight:
bold'>On Behalf Of </span></b>Christopher Harris<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, =
September 26,
2007 10:02 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
MAPSERVER-USERS at LISTS.UMN.EDU<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> =
[UMN_MAPSERVER-USERS]
Rasters, TileIndex and Shapefiles - Oh My! Really =
Confused<o:p></o:p></span></font></p>
</div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> </span></font><font size=3D2 face=3DTahoma><span =
style=3D'font-size:
10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>Hi. I have a map =
that is
broken up into a bunch of .gif tiles. I want to display them on a =
layer
in Mapserver. I have working version of what I want to accomplish, =
but it
uses one .gif (the big map pic), attaches the big map to the globe via a =
world
file. That big map .gif had no georeferencing info attached to =
it.<br>
<br>
These .gifs have no georeferencing information included or attached as =
well.<br>
<br>
I read Section 4 (and Section 9 too) on the mapserver site page:
http://mapserver.gis.umn.edu/docs/howto/raster_data<br>
<br>
More information about the mapserver-users
mailing list