Tim wrote: > I am an archaeologist mainly working within woodlands and > need to be be able to display in grass of similar GIS the > location of woodland banks and their associated > ditches. There is a standard set of symbols for this
any online link to an image of what they look like? > but is there a way of actually getting GRASS or other GIS to > implement these. are they point symbols or line styles? point symbols: http://grass.osgeo.org/wiki/IconSymbols line styles are more tricky, but I would not say impossible. > If not has anyone any ideas on how to write the appropriate > code or adapt other code to do it. My initial thoughts > were to digitize the location of the features to a vector > map. e.g. the fish on the above wiki page was "digitized" from the QGIS .svg symbol in Inkscape, then a little Bézier curve math to make the x,y points, http://grass.osgeo.org/wiki/Symb-fish the "classic" model for this is the CERL castle graphic for d.graph (see d.graph/grass_logo.txt in the source code), initially drawn on graph paper and then transfered. > As a vector it has direction and therefore if a > standard was adopted say for example if a ditch existed it > was on the rhs of the vector and the dashes marking the bank > could then be placed on the lhs. so you mean like cliff polylines rendered by Mapnik for OpenStreetMap: http://wiki.openstreetmap.org/wiki/Cliff e.g. http://www.openstreetmap.org/?lat=-44.1026&lon=-176.5281&zoom=13&layers=M ? see also geology/strike_triangle: http://grass.osgeo.org/wiki/IconSymbols#New grass vector lines have direction, so setting them as true-left and right bank can be easily done. (see `d.vect display=dir`) > Eventually the information about the profile of the bank > and ditch needs to be analyzed statistically so having the > information within a data base makes good sense. should be pretty easy if lines were as a vector map. a number of tools exist for it. regards, Hamish _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
