nsw_lidar
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- | Page for documenting | + | ====== Mapping from NSW Lidar with QGIS ====== |
+ | NSW Spatial Services have undertaken a program to map all of NSW using lidar (light detecting and ranging) | ||
+ | For details, see information on their [[http:// | ||
+ | |||
+ | Elevation data can best be accessed through the [[http:// | ||
+ | |||
+ | It can then processed with a GIS such as [[https:// | ||
+ | |||
+ | ====== Topics ====== | ||
+ | |||
+ | The original topics here have now been moved to their own pages. | ||
+ | |||
+ | Any feedback/ | ||
+ | |||
+ | ===== Managing DEMs ===== | ||
+ | |||
+ | * [[nsw_merge_dems|Merging DEMs]] - how to merge DEMs in QGIS | ||
+ | * [[nsw_dems|Managing large DEMs]] - while data can be downloaded in an ad hoc manner, if you are regularly | ||
+ | |||
+ | ===== Topographic maps ===== | ||
+ | |||
+ | There are several primary data items for topographic maps that can be generated using the DEM data from the NSW Lidar. | ||
+ | |||
+ | * [[qgis_depressionless_dem|Hydrologically correct DEM]] - prior to further operations, it is usually important to make sure that your DEM is free of depressions. Otherwise these will mess up streams and possibly contours. | ||
+ | |||
+ | Once you have a depressionless DEM, the following items can be generated: | ||
+ | * [[qgis_contours|Contours]] | ||
+ | * [[qgis_hydrology|Hydrology (Stream Network)]] | ||
+ | * [[qgis_slope|Slopes]] - while not a standard feature of topographic maps, this can be a simple way to identify cliffs | ||
+ | * [[qgis_clifflines|Clifflines]] - a work in progress | ||
+ | |||
+ | ===== Styles ===== | ||
+ | |||
+ | * [[qgis_styling|Styling]] - download basic style files | ||
+ | |||
+ | ===== Automation ===== | ||
+ | |||
+ | * [[qgis_basic_automation|Basic map creation]] - a set of PyQGIS scripts that will create (and optionally save) a basic topographic map. This map can be used in QField | ||
+ | |||
+ | ===== Mobile apps ===== | ||
+ | |||
+ | * [[qgis_qfield|QField]] - QField is an excellent Android app for for viewing projects created with QGIS | ||
+ | * [[https:// | ||
+ | |||
+ | ===== Dumping Ground / WIP ===== | ||
+ | |||
+ | ==== Resources ==== | ||
+ | * [[https:// | ||
+ | * [[http:// | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | [[https:// | ||
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+ | [[http:// | ||
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+ | [[https:// | ||
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+ | [[https:// | ||
+ | ==== Method ==== | ||
+ | The below snip of Breakfast Creek makes use of TPI calculated from a LIDAR derived DEM. Only positive values for TPI as displayed, which indicate cliff-like features. It is then combined with contours and aerial imagery to convey the terrain of the area. | ||
+ | |||
+ | {{: |
nsw_lidar.txt · Last modified: 2024/04/05 19:00 by bushwalking