MJR42 Thoughts

Well, I've made a fair bit of progress, and learned quite a bit about GRASS on the way. It's probably a good time to do an assessment of where I am and what I'll tackle next. Raster Layers: I've got DEM maps for Vancouver Island from GeoBase which are free usage. I've merged them into a single large DEM raster for the southern half of the island. Playing with the display region shows that this is a pretty slow-loading way to go even if it's convenient to have all of the rasters combined into one. Task 1: Figure out how to reduce raster resolution for different display region sizes and create a layer collection that changes the loaded raster resolution depending on the scale of the displayed region. I'm also a little put off by having to think of the resolution and size of the region in terms of degrees. To me it's more natural to think in terms of map scales (e.g. 1:50,000). Task 2: Figure out how to display/work with the scale instead of the region s

Well, I've managed to download a bunch of digital elevation maps and combine them into a single raster. Then I've extracted contours. One map I've created looks like this: The problem I face now is figuring out how to extract polygons from the contour vector layers and create the lake surfaces for the maps. BTW, the reason that the contours only cover the eastern part of the map is that the contour extraction routine crashes for wider regions. I still need to go back and extract the western half and merge the two layers into a single contour coverage.