Changes between Version 19 and Version 20 of Processing/NextMapDEMs


Ignore:
Timestamp:
Oct 11, 2011 10:35:32 AM (7 years ago)
Author:
knpa
Comment:

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  • Processing/NextMapDEMs

    v19 v20  
    11= !NextMap data =
    22
    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:
     3A 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:
    44 http://www.neodc.rl.ac.uk/?option=displaypage&Itemid=85&op=page&SubMenu=-1
    55
    6 = Creation of DEMs from !NextMap data =
     6== Creation of DEMs from !NextMap data ==
    77
     8=== nextmapdem.sh ===
     9
     10(arsf-dan internal use only)
     11
     12Automatically creates a DEM from our collection of nextmap data stored in ~arsf/nextmap_dems/neodc/by_tile/by_product/dsm/ [[BR]]
     13Can create either an ascii DEM for use with azgcorr or a binary latlong DEM which is suitable for aplcorr. [[BR]]
     14Run nextmapdem.sh in the top project directory as the arsf user.
     15
     16
     17=== Manual ===
     18
     19Note: This section describes how to create an azgcorr compatible ascii DEM only. [[BR]]
    820The 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.
    921
     
    1527
    1628----------
    17 == Command line method ==
     29==== Command line method ====
    1830
    1931If 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`.
     
    3547Then 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).
    3648
    37 == Adding the azgcorr header ==
     49===== Adding the azgcorr header =====
    3850
    3951Run 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.
     
    6577
    6678---------
    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): =====
    6880
    69 In GRASS:
    7081{{{
    7182# Restrict active region to area you're interested in - must use eastings/northings, lat/long seems to have problems determining valid values
     
    95106
    96107
    97 == GRASS GUI method ==
     108==== GRASS GUI method ====
    98109
    99110(brief description)