Changes between Version 29 and Version 30 of Help/LeicaLidarDems

Timestamp:

Feb 28, 2012, 1:09:02 PM (14 years ago)

Author:

mark1

Comment:

--

Help/LeicaLidarDems

@@ -62 +62 @@
 === Dealing with small holes ===
 
-[[Image(mosaic_with_holes.png,width=150,align=right,margin=20)]]
-
-
 If '''small''' holes are present in your data, say due to small lakes or removed noise, the easiest way to fill these in is to patch the data with a lower resolution version of the LiDAR. This can be done by changing the region to a lower resolution and resampling:
 
@@ -177 +174 @@
 
 
-
-
-[[Image(interp_with_mask.png,width=100)]]
-{{{
-#!html
-<p style="text-align: center">Figure: Interpolated point cloud data after implementing a mask.</p>
-}}}
-
-To extend the coverage of your DEM, if required, it is suggested to patch on external DEM data. If you have access to a good quality DEM then use that, else the SRTM 3 arc second DEM is freely available and covers most of the globe between +-60 degrees latitude. To see how to make a DEM from SRTM data see the [wiki:Processing/SRTMDEMs SRTM DEM] page. Make sure to select the projection  the same as your LIDAR DEM. Also, be aware that the SRTM elevations are with respect to a geoid model and will need to be converted to the LIDAR vertical datum.
-
-Once you have an SRTM DEM of sufficient coverage you can patch the LIDAR and SRTM DEMs together, such that the LIDAR takes precedence. This means the lidar_dem should be the first of the input maps on the r.patch command. If the mask is still applied then remove it before patching:
-
-10. '''`r.mask input=<maskmapname> -r`'''
-
-11. '''`r.patch in=lidar_dem,srtm_dem out=combined_dem`'''
-
-[[Image(combo_srtm_lidar.png,width=100)]]
-{{{
-#!html
-<p style="text-align: center">Figure: Interpolated point cloud data after implementing a mask with SRTM DEM data to fill in the rest of the region.</p>
-}}}
-
-To output the DEM (as ascii) and set null values as 0:
-
-12.    '''`r.out.ascii input=<DEMmapname> output=<outputDEMfile> null=0`'''
 
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