<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
Hi,<br>
I looked at your files. The borderless map are 8 byte file but they
are Boolean value files 0 and 1 only (black and white file. No gray
scale). In this case, 0 = data and 1 = no data??? (use the value
plugin to see this). So if you set your 1 values to no data (layer
properties/transparency/additional no data value), and set your
layer style from black to white (and not the default white to black)
you will see that your data is well georeferenced. (use an open
layer layer like osm or Google map as background.)<br>
<br>
The files with borders (honolulu1928.tif) are Eight bit unsigned
integer but they are on a gray scale so the vary between 0 and
255. If you look at the geotagg, (raster/miscellaneous/info (see
below) that the file has some georeferencing info like the crs but
the coordinate are wrong (Corner Coordinates:<br>
Upper Left ( 0.0, 0.0)). So if you turn on the "CRS on the
fly" and then zoom to the layer extent, you will see the map in the
sea. It's not that the map does not appear... it's that it is in
the wrong spot.<br>
<br>
I also see this tag (TIFFTAG_SOFTWARE=Adobe Photoshop CS Windows).
It is possible that Photoshp was used in the past and that it
striped away the coordinates. Since you have the coordinates on the
map, you can use the gdal georeferencing plugin to place the map in
the correct spot.<br>
Good luck<br>
<br>
Nicolas<br>
<br>
==============<br>
Driver: GTiff/GeoTIFF<br>
Files: C:/Users/Nicolas/Downloads/1928 Honolulu/honolulu1928.tif<br>
C:/Users/Nicolas/Downloads/1928
Honolulu/honolulu1928.tif.aux.xml<br>
Size is 12000, 10519<br>
Coordinate System is:<br>
PROJCS["NAD_1983_HARN_UTM_Zone_4N",<br>
GEOGCS["GCS_North_American_1983_HARN",<br>
DATUM["NAD83_High_Accuracy_Reference_Network",<br>
SPHEROID["GRS_1980",6378137.0,298.257222101]],<br>
PRIMEM["Greenwich",0.0],<br>
UNIT["Degree",0.0174532925199433]],<br>
PROJECTION["Transverse_Mercator"],<br>
PARAMETER["False_Easting",500000.0],<br>
PARAMETER["False_Northing",0.0],<br>
PARAMETER["Central_Meridian",-159.0],<br>
PARAMETER["Scale_Factor",0.9996],<br>
PARAMETER["Latitude_Of_Origin",0.0],<br>
UNIT["Meter",1.0],<br>
AUTHORITY["EPSG","3750"]]<br>
Metadata:<br>
TIFFTAG_DATETIME=2006:06:15 07:13:01<br>
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)<br>
<b><u> TIFFTAG_SOFTWARE=Adobe Photoshop CS Windows</u></b><br>
TIFFTAG_XRESOLUTION=400<br>
TIFFTAG_YRESOLUTION=400<br>
Image Structure Metadata:<br>
INTERLEAVE=BAND<br>
<u><b>Corner Coordinates:</b></u><u><b><br>
</b></u><u><b>Upper Left ( 0.0, 0.0)</b></u><u><b><br>
</b></u><u><b>Lower Left ( 0.0,10519.0)</b></u><u><b><br>
</b></u><u><b>Upper Right (12000.0, 0.0)</b></u><u><b><br>
</b></u><u><b>Lower Right (12000.0,10519.0)</b></u><br>
Center ( 6000.0, 5259.5)<br>
Band 1 Block=12000x1 Type=Byte, ColorInterp=Gray<br>
Min=0.000 Max=255.000 <br>
Minimum=0.000, Maximum=255.000, Mean=193.512, StdDev=41.612<br>
Metadata:<br>
LAYER_TYPE=athematic<br>
STATISTICS_MAXIMUM=255<br>
STATISTICS_MEAN=193.51169711538<br>
STATISTICS_MINIMUM=0<br>
STATISTICS_STDDEV=41.611752735755<br>
====================<br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">Le 2016-01-04 03:04, Jan Becket [via
OSGeo.org] a écrit :<br>
</div>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em'
cite="mid:6DB55752-6752-4EC1-A506-0EC135251AA4@gmail.com"
type="cite">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Yes, the min/max values are between 0 and 1. This is strange,
because when I open the file in Photoshop (and then exit without
saving), it is an 8-bit grayscale. I actually have two sets of
1928-30 USGS geotiffs for the island of Oahu. The set I was able
to mount contains 16 geotiff files for each of the 16 quads that
are 4-5 mb in size. The other set contains 16 geotiff files that
are about 125 mb each, and clearly grayscale. These USGS quads,
however, have collars and are less desirable for that reason. In
any case, they are not visible when I attempt to import / mount
them. In case anyone has a suggestion, I have placed the Honolulu
quad for both sets of maps in this dropbox folder: <a
moz-do-not-send="true"
href="https://www.dropbox.com/sh/te9et5yuery207d/AAAYnBBkBzUod53RauD7ArTda?dl=0"
class="" target="_top" rel="nofollow" link="external">https://www.dropbox.com/sh/te9et5yuery207d/AAAYnBBkBzUod53RauD7ArTda?dl=0</a>
<div class=""><br class="">
</div>
<div class="">As far as I can tell, the CRS for both sets of maps
is Old Hawaiian. I think I mentioned earlier that I am
reprojecting to CRS 3711: NAD 83, UTM zone 4N.</div>
<div class=""><br class="">
</div>
<div class="">Thanks, as always, for suggestions -</div>
<div class="">Jan</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
<div>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #CCCCCC;padding:0
1em" type="cite" class="">
<div class="">Message: 1<br class="">
Date: Sat, 2 Jan 2016 15:58:12 -0800 (PST)<br class="">
From: Nicolas Cadieux <<a moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5243557&i=0"
target="_top" rel="nofollow" link="external">[hidden
email]</a>><br class="">
To: <a moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5243557&i=1"
target="_top" rel="nofollow" link="external">[hidden
email]</a><br class="">
Subject: Re: [Qgis-user] 1928-1930 USGS maps<br class="">
Message-ID: <<a moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5243557&i=2"
target="_top" rel="nofollow" link="external">[hidden
email]</a>><br class="">
Content-Type: text/plain; charset="utf-8"<br class="">
<br class="">
Good but weird. <br class="">
If you look at the histogram, are all values between 0 and
1? <br class="">
Nicolas Cadieux M.Sc. <br class="">
Les Entreprises Archéotec inc.  <br
class="">
8548, rue Saint-Denis Montréal H2P 2H2 <br
class="">
Téléphone: 514.381.5112
 Fax: 514.381.4995 <br class="">
<a moz-do-not-send="true" href="http://www.archeotec.ca"
class="" target="_top" rel="nofollow" link="external">www.archeotec.ca</a>
<br class="">
On Dec 28, 2015 17:29, "William Kyngesburye [via
<a moz-do-not-send="true" href="http://OSGeo.org" class=""
target="_top" rel="nofollow" link="external">OSGeo.org</a>]<span
class="Apple-tab-span" style="white-space:pre"> </span>"
<<a moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5243557&i=3"
target="_top" rel="nofollow" link="external">[hidden
email]</a>> wrote: <br class="">
<br class="">
<span class="Apple-tab-span" style="white-space:pre"> </span>Max
1? Odd for a greyscale image. Or are they 1bit images?<br
class="">
At least it's working.<br class="">
> On Dec 28, 2015, at 4:12 PM, Jan Becket <
[hidden email] > wrote:<br class="">
> <br class="">
> With your suggestions and those of Nicolas I was
able to make the maps appear. I trashed the copies I had
altered in Photoshop, loaded the original (black) images,
set the min as 0 and the max as 1 and then stretched to
min/max. That turned out to be easy. Thanks for the help!<br
class="">
> <br class="">
> - Jan<br class="">
> <br class="">
> <br class="">
>> On Dec 28, 2015, at 4:42 AM, William
Kyngesburye < [hidden email] > wrote:<br
class="">
>> <br class="">
>> Or, QGIS should be able to read 16bit
greyscale images without breaking them with Photoshop.
You just need to set a min and max to include the 16bit
range and stretch the contrast to minmax. Make sure you
are not using QGIS 2.10 - that had a broken raster styling
on OS X.<br class="">
>> <br class="">
>> Alternately, use GDAL to convert to 8bit,
not Photoshop. "gdal_translate -scale -ot
Byte" should do it (in Terminal, I don't
see the -scale or -ot options in QGIS GDAL convert
format).<br class="">
>> <br class="">
>>> On Dec 28, 2015, at 12:53 AM,
Nicolas Cadieux < [hidden email] > wrote:<br
class="">
>>> <br class="">
>>> Hi,<br class="">
>>> You are correct, you have stripes
the CRS info from the map because Photoshop does not know
what to do. If you load the map, you can click on raster..
Something... Gdal-info. That should give you all the
tagged info left in the image.<br class="">
>>> <br class="">
>>> Load the map in QGIS and click on
"zoom to layer extent". If you still
don't see it, make sure you are in a CRS that is
projected in meters. You should be able to see it. The
map should be at 0,0.<br class="">
>>> <br class="">
>>> All is not loss... You can
reproject the map to the correct CRS using the gdal
georeferencing tool. Always back up your data before
manipulating it.<br class="">
>>> Hope this helps!<br class="">
>>> <br class="">
>>> Nicolas Cadieux M.Sc.<br class="">
>>> Les Entreprises Archéotec inc. <br
class="">
>>> 8548, rue Saint-Denis Montréal
H2P 2H2<br class="">
>>> Téléphone: 514.381.5112 Fax:
514.381.4995<br class="">
>>> <a moz-do-not-send="true"
href="http://www.archeotec.ca" class="" target="_top" rel="nofollow" link="external">www.archeotec.ca</a><br
class="">
>>> <br class="">
>>> On Dec 28, 2015 01:16,
"Jan Becket [via <a moz-do-not-send="true"
href="http://OSGeo.org" class="" target="_top" rel="nofollow" link="external">OSGeo.org</a>]"
<[hidden email]> wrote:<br class="">
>>> After much effort, I obtained an
old set of 1928-1930 USGS topo maps of Oʻahu Island,
Hawaiʻi - for a project I am working on. The maps are
without collars and used by a local archaeological firm.
The geotiff maps at first showed as completely black on my
Mac system (10.10.5 - Yosemite). However I found this link
with a resultuion for the issue:<br class="">
>>> <br class="">
>>> <a moz-do-not-send="true"
href="http://stackoverflow.com/questions/13925995/options-to-convert-16-bit-image"
class="" target="_top" rel="nofollow" link="external">http://stackoverflow.com/questions/13925995/options-to-convert-16-bit-image</a>
>>> <br class="">
>>> I opened the 16 quads for Oʻahu
in Photoshop and applied auto levels, after which they
became discernable quad maps. However, when imported into
QGIS, they are now invisible. I wonder if it is possible
that I stripped away the geotiff CRS information. Prior to
the Photoshop operation, the maps did appear correctly
referenced to Oʻahu Island (although they were totally
opaque / black).<br class="">
>>> <br class="">
>>> Now, the maps in QGIS are not
visible, although the geotiffs are several megabytes in
size and are visible when opened in Photoshop, Preview, or
whatever image viewer. <br class="">
>>> <br class="">
>>> I should mention that I have
successfully imported other sets of USGS maps of Oʻahu for
this project - the 1902 series, the 1916 series, the 1935
series - as well as the current series. The early maps
used the Old Hawaiian CRS (EPSG 3564) but more modern maps
use WGS83, Zone 4N (EPSG 3711). I have on the fly
projection enabled and have tried many CRS settings for
the maps, but nothing results in a visible quad appearing.<br
class="">
>>> <br class="">
>>> Suggestions very welcome ...<br
class="">
-----<br class="">
William Kyngesburye
<kyngchaos*at*kyngchaos*dot*com><br class="">
<a moz-do-not-send="true" href="http://www.kyngchaos.com/"
class="" target="_top" rel="nofollow" link="external">http://www.kyngchaos.com/</a>
"This is a question about the past, is it? ... How
can I tell that the past isn't a fiction designed
to account for the discrepancy between my immediate
physical sensations and my state of mind?"<br
class="">
- The Ruler of the Universe<br class="">
_______________________________________________<br
class="">
</div>
</blockquote>
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<br class="">
</div>
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