[GRASS-user] Importing ESRI Grid file ... or Shapefile?
Rich Shepard
rshepard at appl-ecosys.com
Sat Sep 10 11:12:37 PDT 2016
The LiDAR data files do not have the same extent as the vector files, and
they should. I think I incorrectly imported them.
There are two flavors of the files: ESRI Grid and Shapefiles.
I used the Grid files, specifying hdr.adf as the file to use. But, since
the .prj file is specified when importing a shapefile I wonder if that's
what I need with the Grid format. The metadata.xml has these bounds:
<westbc Sync="TRUE">-123.253402</westbc>
<eastbcSync="TRUE">-123.131197</eastbc>
<northbcSync="TRUE">45.002688</northbc>
<southbcSync="TRUE">44.925436</southbc>
and
<leftbc Sync="TRUE">600316.500000</leftbc>
<rightbcSync="TRUE">631069.500000</rightbc>
<bottombcSync="TRUE">1169386.500000</bottombc>
<topbc Sync="TRUE">1196554.500000</topbc>
Looks like both long/lat and Oregon State Plane coordinates are provided.
The prj.adf file contains:
Projection LAMBERT
Datum HPGN
Spheroid GRS80
Units 3.280839895013123
Zunits NO
Xshift 0.0
Yshift 0.0
Parameters
43 0 0.0 /* 1st standard parallel
45 30 0.0 /* 2nd standard parallel
-120 30 0.0 /* central meridian
41 45 0.0 /* latitude of projection's origin
400000.0 /* false easting (meters)
0.0 /* false northing (meters)
The Shapefile for the area including my project has this projection:
PROJCS["Lambert Conformal Conic", GEOGCS["GCS North American 1983
HARN",DATUM["D North American 1983 HARN",SPHEROID["GRS 1980",6378137.0,298.257222101]],
PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],
PROJECTION["Lambert Conformal Conic"],
PARAMETER["False Easting",1312335.958005249],
PARAMETER["False Northing",0.0],
PARAMETER["Central Meridian",-120.5],
PARAMETER["Standard Parallel 1",43.0],
PARAMETER["Standard Parallel 2",45.5],
PARAMETER["Latitude Of Origin",41.75],
UNIT["Foot",0.3048]]
Should I put these source files in the WGS84-lat-long location, the
Oregon-ll83 location, or the project location which is the Oregon State
Plane projection? And, do I import the Grid or shapefile? I'm confused.
TIA,
Rich
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