Werner,<br><br>You swapped the X and Y extents in the command.<br><br><div class="gmail_quote">On Thu, Jan 27, 2011 at 11:14 PM, Werner Reiche <span dir="ltr"><<a href="mailto:w.reiche@hotmail.com">w.reiche@hotmail.com</a>></span> wrote:<br>
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<br>I'm trying to use gdal_grid to generate a .tiff file from a .csv file.<br> <br>The problem I am encountering is that output file always contains 'no-data' values.<br> <br>The command I am using is:<br> <br>
<font face="Arial" size="2">gdal_grid -txe -51.428009 -43.153992 -tye 46.112598 51.347198 -outsize 1024 796 \</font> <br><font face="Arial" size="2"> -a nearest:radius1=10.0:radius2=10.0:angle=0.0:nodata=0.0 \</font> <br>
<font face="Arial" size="2"> -l rs2_file_1 -l rs2_file_2 -l rs2_file_3 \</font> <br><font face="Arial" size="2"> -of GTiff -ot Byte rs2_file.vrt test.tiff</font> <br> <br>I have also tried the following interpolation parameters:<br>
<br><font face="Arial" size="2"># Results in all black</font> <br><font face="Arial" size="2"># -a nearest:radius1=1.0:radius2=1.0:angle=0.0:nodata=0.0 \</font> <br><font face="Arial" size="2"># -a average:radius1=1.0:radius2=1.0:angle=0.0:min_points=1:nodata=0.0 \</font> <br>
<font face="Arial" size="2"># -a invdist:radius1=1.0:radius2=1.0:angle=0.0:max_points=1:min_points=1:nodata=0.0 \</font> <br><font face="Arial" size="2"></font> <br><font face="Arial" size="2"># Results in all one shade of grey</font> (average of entire image)<br>
<font face="Arial" size="2"># -a invdist:radius1=0.0:radius2=0.0:angle=0.0:max_points=10:min_points=1:nodata=0.0 \</font> <br><br>The .vrt and csv file used are shown below.<br> <br><font face="Arial" size="2">rs2_file.vrt</font> <br>
<font face="Arial" size="2">::::::::::::::</font> <br><font face="Arial" size="2"><OGRVRTDataSource></font> <br><font face="Arial" size="2"><OGRVRTLayer name="rs2_file_1"></font> <br><font face="Arial" size="2"><SrcDataSource>rs2_file_1.csv</SrcDataSource></font> <br>
<font face="Arial" size="2"><GeometryType>wkbPoint25D</GeometryType></font> <br><font face="Arial" size="2"><GeometryField encoding="PointFromColumns" x="lon" y="lat" z="red"/></font> <br>
<font face="Arial" size="2"></OGRVRTLayer></font> <br><font face="Arial" size="2"><OGRVRTLayer name="rs2_file_2"></font> <br><font face="Arial" size="2"><SrcDataSource>rs2_file_2.csv</SrcDataSource></font> <br>
<font face="Arial" size="2"><GeometryType>wkbPoint25D</GeometryType></font> <br><font face="Arial" size="2"><GeometryField encoding="PointFromColumns" x="lon" y="lat" z="green"/></font> <br>
<font face="Arial" size="2"></OGRVRTLayer></font> <br><font face="Arial" size="2"><OGRVRTLayer name="rs2_file_3"></font> <br><font face="Arial" size="2"><SrcDataSource>rs2_file_3.csv</SrcDataSource></font> <br>
<font face="Arial" size="2"><GeometryType>wkbPoint25D</GeometryType></font> <br><font face="Arial" size="2"><GeometryField encoding="PointFromColumns" x="lon" y="lat" z="blue"/></font> <br>
<font face="Arial" size="2"></OGRVRTLayer></font> <br><font face="Arial" size="2"></OGRVRTDataSource></font> <br><font face="Arial" size="2">rs2_file.vrt (partial)</font> <br><font face="Arial" size="2">::::::::::::::</font> <br>
<font face="Arial" size="2">lat,lon,red,green,blue</font> <br><font face="Arial" size="2">-51.428009,50.522499,0,0,143</font> <br><font face="Arial" size="2">-50.049011,50.720699,0,0,143</font> <br><font face="Arial" size="2">-48.660004,50.902401,0,159,255</font> <br>
<font face="Arial" size="2">-47.260010,51.067501,0,239,255</font> <br><font face="Arial" size="2">-45.851013,51.215900,255,255,15</font> <br><font face="Arial" size="2">-44.433014,51.347198,255,191,0</font> <br><font face="Arial" size="2">-50.433014,50.657600,255,255,0</font> <br>
<font face="Arial" size="2">-49.046997,50.844200,255,223,0</font> <br><font face="Arial" size="2">-47.649994,51.014301,255,159,0</font> <br><font face="Arial" size="2">-46.243988,51.167599,255,191,0</font> <br><font face="Arial" size="2">-44.829010,51.303799,255,255,15</font> <br>
<font face="Arial" size="2">-50.816010,50.593800,255,255,0</font> <br><font face="Arial" size="2">-49.433014,50.784698,255,175,0</font> <br><font face="Arial" size="2">-48.040009,50.959202,255,239,0</font> <br><font face="Arial" size="2">-46.635986,51.117100,255,191,0</font> <br>
<font face="Arial" size="2">-45.222992,51.257999,255,223,0</font> <br><font face="Arial" size="2">-51.197998,50.528301,255,175,0</font> <br><font face="Arial" size="2">-49.819000,50.724098,255,191,0</font> <br><font face="Arial" size="2">-48.428009,50.903500,255,223,0</font> <br>
<font face="Arial" size="2">-47.028015,51.066299,255,207,0</font> <br><font face="Arial" size="2">-45.618011,51.211800,255,255,0</font> <br><font face="Arial" size="2">-44.199005,51.340199,255,255,0</font> <br><font face="Arial" size="2">-50.203003,50.661999,223,255,47</font> <br>
<font face="Arial" size="2">-48.816010,50.845798,255,223,0</font> <br><font face="Arial" size="2">-47.417999,51.013000,255,191,0</font> <br><font face="Arial" size="2">-46.010986,51.163502,255,207,0</font> <br><font face="Arial" size="2">-44.595001,51.297001,255,255,15</font> <br>
<font face="Arial" size="2">-50.585999,50.598900,255,191,0</font> <br><font face="Arial" size="2">-49.201996,50.787601,255,255,0</font> <br><br> </div>
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