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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'>Let me suggest you try to get =
unconfused
just one step at a time!<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'>“</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.<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'>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.<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 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.<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'>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.<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'>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).<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>
<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'> 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</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 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
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