Changes between Version 19 and Version 20 of Processing/NextMapDEMs
- Timestamp:
- Oct 11, 2011, 10:35:32 AM (13 years ago)
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Processing/NextMapDEMs
v19 v20 1 1 = !NextMap data = 2 2 3 A 5m DEM dataset generated from airborne radar mapping. NEODC holds the dataset and can distribute it to registered academic users. Sign up at:3 A 5m DEM dataset generated from airborne radar mapping. NEODC holds the dataset and can distribute it to registered academic users. You can sign up at: 4 4 http://www.neodc.rl.ac.uk/?option=displaypage&Itemid=85&op=page&SubMenu=-1 5 5 6 = Creation of DEMs from !NextMap data=6 == Creation of DEMs from !NextMap data == 7 7 8 === nextmapdem.sh === 9 10 (arsf-dan internal use only) 11 12 Automatically creates a DEM from our collection of nextmap data stored in ~arsf/nextmap_dems/neodc/by_tile/by_product/dsm/ [[BR]] 13 Can create either an ascii DEM for use with azgcorr or a binary latlong DEM which is suitable for aplcorr. [[BR]] 14 Run nextmapdem.sh in the top project directory as the arsf user. 15 16 17 === Manual === 18 19 Note: This section describes how to create an azgcorr compatible ascii DEM only. [[BR]] 8 20 The azgcorr format is plain ASCII text, with decimal numbers separated by spaces, one row per row of the DEM. At the top of the file, you need a single line that describes the geographic position of the DEM. 9 21 … … 15 27 16 28 ---------- 17 == Command line method==29 ==== Command line method ==== 18 30 19 31 If you don't have a suitable grass location and don't want to work out how to create one, download the attached [attachment:grass_db_template-BNG.tar.gz grass template for UK British National Grid] projection and start with a command like `grass62 /path/to/grass_db_template/UKBNG/PERMANENT`. … … 35 47 Then run the demheaderconvert.sh script or manually edit the DEM file to include an azgcorr header (or you can specify this on the command line if you prefer). 36 48 37 == Adding the azgcorr header==49 ===== Adding the azgcorr header ===== 38 50 39 51 Run the script to convert the ASCII file to have an azgcorr compatible header. Note this will delete the original ASCII file unless you specify -nodel at the end. The optional resolution argument specifies the DEM grid resolution in metres, defaults to 5m if omitted. … … 65 77 66 78 --------- 67 == To add a zero-level area to a map (ie sea level):==79 ===== To add a zero-level area to a map (ie sea level): ===== 68 80 69 In GRASS:70 81 {{{ 71 82 # Restrict active region to area you're interested in - must use eastings/northings, lat/long seems to have problems determining valid values … … 95 106 96 107 97 == GRASS GUI method==108 ==== GRASS GUI method ==== 98 109 99 110 (brief description)