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<div class="moz-cite-prefix">On 03/07/2020 12:33, 李泽浩 wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAEP1KrS0OC1kQ9X3LqqDJ-Lbrs1Dn-GhQm4bDt1SxPv+dW83pw@mail.gmail.com">
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<div dir="ltr">Thanks for your advice! But I fail to run the "
grass -c
" code in the GRASS console. Is it should be run elsewhere?</div>
</blockquote>
<p><br>
</p>
<p>(Keeping the thread on the list)</p>
<p><br>
</p>
<p>Sorry, you need to run the grass -c command *outside of grass*,
at the regular command prompt (OSGeo2W shell if you installed from
OSGeo4W)</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:CAEP1KrS0OC1kQ9X3LqqDJ-Lbrs1Dn-GhQm4bDt1SxPv+dW83pw@mail.gmail.com"><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Micha Silver <<a
href="mailto:tsvibar@gmail.com" moz-do-not-send="true">tsvibar@gmail.com</a>>
于2020年7月3日周五 下午5:07写道：<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> <br>
<div>On 03/07/2020 11:53, 李泽浩 wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi Micha,
<div><br>
</div>
<div>Thanks for your reply! Here is the output from <b>gdalinfo</b>: </div>
<div>This DEM is projected from WGS84 to CGCS 2000 in
ArcMap first and then imported in GRASS.</div>
<div><br>
</div>
<div><font face="times new roman, serif">gdalinfo
C:\Users\zhangtong\Desktop\Zehao_DEM.tif
<br>
Driver: GTiff/GeoTIFF<br>
Files: C:\Users\zhangtong\Desktop\Zehao_DEM.tif<br>
Size is 3353, 1748<br>
Coordinate System is:<br>
PROJCS["CGCS2000_3_Degree_GK_CM_120E",<br>
GEOGCS["GCS_China_Geodetic_Coordinate_System_2000",<br>
DATUM["China_2000",<br>
SPHEROID["CGCS2000",6378137,298.257222101]],<br>
PRIMEM["Greenwich",0],<br>
UNIT["degree",0.0174532925199433]],<br>
PROJECTION["Transverse_Mercator"],<br>
PARAMETER["latitude_of_origin",0],<br>
PARAMETER["central_meridian",120],<br>
PARAMETER["scale_factor",1],<br>
PARAMETER["false_easting",500000],<br>
PARAMETER["false_northing",0],<br>
UNIT["metre",1,<br>
AUTHORITY["EPSG","9001"]]]<br>
Origin = (118.670833333333334,42.996666666666670)<br>
Pixel Size = (0.000833333333333,-0.000833333333333)<br>
Metadata:<br>
AREA_OR_POINT=Area<br>
DataType=Generic<br>
Image Structure Metadata:<br>
INTERLEAVE=BAND<br>
Corner Coordinates:<br>
Upper Left ( 118.6708333, 42.9966667)
(115d30'50.80"E, 0d 0' 1.40"N)<br>
Lower Left ( 118.6708333, 41.5400000)
(115d30'50.80"E, 0d 0' 1.35"N)<br>
Upper Right ( 121.4650000, 42.9966667)
(115d30'50.89"E, 0d 0' 1.40"N)<br>
Lower Right ( 121.4650000, 41.5400000)
(115d30'50.89"E, 0d 0' 1.35"N)<br>
Center ( 120.0679167, 42.2683333)
(115d30'50.84"E, 0d 0' 1.37"N)<br>
Band 1 Block=128x128 Type=Int16, ColorInterp=Gray<br>
NoData Value=32767</font><br>
</div>
<div><font face="trebuchet ms, sans-serif"><br>
</font></div>
</div>
</blockquote>
<p><br>
</p>
<p><br>
</p>
<p><font face="trebuchet ms, sans-serif">OK, that looks
good.</font></p>
<p><font face="trebuchet ms, sans-serif">Now you can create
a new LOCATION for your GRASS data using that DEM
projection information as follows:</font><br>
<font face="trebuchet ms, sans-serif">(I'll assume you
want your GRASS database under: </font>C:\Users\zhangtong\grassdata)</p>
<p><br>
</p>
<p>grass -c C:\Users\zhangtong\Desktop\Zehao_DEM.tif -e
C:\Users\zhangtong\grassdata\CGCS2000\PERMANENT</p>
<p><br>
</p>
<p>THis command creates a new LOCATION based on the DEM
coordinate system, then exits (-e option).</p>
<p>Now start GRASS in that new location and you should be
able to import your DEM without problem:</p>
<p><br>
</p>
<p>grass C:\Users\zhangtong\grassdata\CGCS2000\PERMANENT</p>
<p><br>
</p>
<p>and then at the GRASS command prompt:</p>
<p>r.import C:\Users\zhangtong\Desktop\Zehao_DEM.tif
output=zehao_dem</p>
<p>g.region -ap rast=zehao_dem<br>
</p>
<p><br>
</p>
<p><font face="trebuchet ms, sans-serif"><br>
</font></p>
<p><br>
</p>
<blockquote type="cite">
<div dir="ltr">
<div><font face="trebuchet ms, sans-serif"><br>
</font></div>
<div><font face="trebuchet ms, sans-serif">Zac</font></div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Micha Silver <<a
href="mailto:tsvibar@gmail.com" target="_blank"
moz-do-not-send="true">tsvibar@gmail.com</a>>
于2020年7月3日周五 下午4:43写道：<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div> <br>
<div>On 02/07/2020 20:58, Zac45 wrote:<br>
</div>
<blockquote type="cite">
<pre>Hi,
I am quite new to GRASS and this is my first post, looking for some help
here!</pre>
</blockquote>
Welcome<br>
<blockquote type="cite">
<pre>I am now processing the dataset under *CGCS2000 / 3-degree Gauss-Kruger CM
120E*. But the dataset could not be recognised by GRASS when I trying to
import the DEM data. The warning message kept poping up: </pre>
</blockquote>
<p>Can you show the CRS of your original DEM before
import into GRASS. What's the output from:</p>
<p><br>
</p>
<p>gdalinfo <your_original_DEM></p>
<p>?</p>
<p><br>
</p>
<blockquote type="cite">
<pre>WARNING: Datum <China_2000> not recognised by GRASS and no parameters found
And the output from g.region -p is:
projection: 99 (CGCS2000 / 3-degree Gauss-Kruger CM 120E)
zone: 0
datum: ** unknown (default: WGS84) **
ellipsoid: grs80
north: 1
south: 0
west: 0
east: 1
nsres: 1
ewres: 1
rows: 1
cols: 1
cells: 1
How can I fix it?
Best,
Zac45
--
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</blockquote>
<pre cols="72">--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
<a href="https://orcid.org/0000-0002-1128-1325" target="_blank" moz-do-not-send="true">https://orcid.org/0000-0002-1128-1325</a></pre>
</div>
</blockquote>
</div>
</blockquote>
<pre cols="72">--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
<a href="https://orcid.org/0000-0002-1128-1325" target="_blank" moz-do-not-send="true">https://orcid.org/0000-0002-1128-1325</a></pre>
</div>
</blockquote>
</div>
</blockquote>
<pre class="moz-signature" cols="72">--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
<a class="moz-txt-link-freetext" href="https://orcid.org/0000-0002-1128-1325">https://orcid.org/0000-0002-1128-1325</a></pre>
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