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A nice training dataset for archaeologists can be found here: https://github.com/kacebe/AtlantGIS
The authors describe AtlantGIS as a collection of
Faked GIS-Datasets, simulating an island in the Atlantic for
educational purposes in using GIS in archaeology. All AtlantGIS data
are published under a CC-BY-SA 4.0 license.
The idea is to create ...
Portable GIS has been created by an archaeologist for her archaeology work.
The most current version is Portable GIS Version 3.1 (December 3rd 2012)
The major plus for this package is that it can be used from a USB stick out in the field as well as in the office.
Full Credit goes to Archaeogeek (https://twitter.com/archaeogeek)
Desktop GIS ...
Honestly, editing the DEM in e.g. Photoshop or GIMP might be the easiest route. Here's how you might go about it:
Convert the DEM to a GeoTIFF
This can be done with
gdal_translate -ot Float32 -of GTiff "FILENAME.dem" "FILENAME.tif" (for 32-bit floating point, recommended) or
gdal_translate -ot UInt16 -of GTiff "FILENAME.dem" "FILENAME.tif" (for 16-bit ...
It is not possible to directly improve the DTM without carrying out some sort of smoothing or interpolation. Auxiliary data is needed or the DTM needs to be rebuilt.
To improve the assigned values of elevation in the part covered by forest, return to the raw LiDAR data and test alternative ways to classify ground points and generate a new DTM. For example:
Here is one potential approach to identifying potential settlement limits based on slope:
Run Spatial Analyst > Slope tool, using your DEM as input.
Use Spatial Analyst > Reclassify, with your slope raster as input. Classify the raster into two new classes, setting areas with slope > 10% to one value and < 10% slope to a second value (e.g., 0, 1).
You requirements (least cost route, line of sight) are quite common in GIS, and I think most of the GIS platforms provide such tools. You just need to search for a while to find the suitable platform have these tools, though I'd suggest to use QGIS (open source) or ArcGIS (proprietary).
Here are some good sites I have been able to get data from in the past.
http://db.edcs.eu/epigr/epimap.html (amazing map and data showing locations of found roman inscriptions all over europe, africa, asia)