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<div class="moz-cite-prefix">On 21/09/2016 02:30, Rich Shepard
wrote:<br>
</div>
<blockquote cite="mid:alpine.LNX.2.11.1609201622140.22351@localhost"
type="cite"> The LiDAR source location has x- and y-resolution of
3 feet
<br>
(international) and several thousand cells east-west and
north-south.
<br>
g.region -p for this location displays:
<br>
<br>
projection: 99 (unnamed)
<br>
zone: 0
<br>
datum: ** unknown (default: WGS84) **
<br>
ellipsoid: grs80
<br>
north: 1286590.24500872
<br>
south: 1240510.24500872
<br>
west: 634966.76150938
<br>
east: 664972.76150938
<br>
nsres: 3
<br>
ewres: 3
<br>
rows: 15360
<br>
cols: 10002
<br>
cells: 153630720
<br>
<br>
When in the project location g.region -p produces:
<br>
<br>
projection: 99
(NAD_1983_HARN_StatePlane_Oregon_North_FIPS_3601_Feet_Intl)
<br>
zone: 0
<br>
datum: nad83harn
<br>
ellipsoid: grs80
<br>
north: 588219.90693215
<br>
south: 536993.58817534
<br>
west: 7524575.13218961
<br>
east: 7561596.20977101
<br>
nsres: 2561.31593784
<br>
ewres: 1851.05387907
<br>
rows: 20
<br>
cols: 20
<br>
cells: 400
<br>
<br>
I want to understand why the nsres is now 2561+ feet, the ewres
now 1851+
<br>
feet, and the numbers of rows and columns has decreased so
drastically.
<br>
<br>
Looking forward to learning,
<br>
<br>
</blockquote>
<br>
The r.proj module has a flag to get the new resolution settings when
reprojection data from one LOCATION to another. Before reprojecting
the map from ** unknown (default: WGS84) ** to nad83harn, try
r.proj -g. Then use those parameters to set the region in the new
CRS/LOCATION. That will leave you with the same number of row and
columns in the new projection.<br>
Then you'll need to do r.proj again to get the raster reprojected
with these new region settings.<br>
<br>
<blockquote cite="mid:alpine.LNX.2.11.1609201622140.22351@localhost"
type="cite">Rich
<br>
<br>
<br>
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<br>
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<br>
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<br>
<a class="moz-txt-link-freetext" href="http://lists.osgeo.org/mailman/listinfo/grass-user">http://lists.osgeo.org/mailman/listinfo/grass-user</a><br>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
Arava Drainage Authority
+972-523-665918</pre>
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