Contour maps depict spatially-varying values, such as elevation, by means of curves of equal value.
9
votes
4answers
874 views
How to place elevation numbers on contours with uphill orientation and position?
I want to orient my elevation labels uphill. Is that possible? I'm currently using the labeling tool from QGIS (not that one in layer settings). I want the labels curved and uphill oriented (and I ...
7
votes
4answers
3k views
Is it possible to make a DEM from contours in QGIS?
Is it possible to make a DEM from contours in QGIS? I have a shp file (contours) and their heights, can I use QGIS for produce a DEM without using GRASS? I find this creating a dem from contours but ...
4
votes
2answers
1k views
Simplify Raster Contours ArcGIS 10
Does anybody know a way to simplify a number of contour polylines derived from a raster dataset? I need to generate a map that shows contour polylines at relatively small scale. With the contour ...
7
votes
2answers
1k views
How to Create Contours for Zonation
I'm still new in the world of GIS.
I'm currently doing some zonation with "test points." Each has its own coordinates and "P" value. I want to make contours of these data, to divide the whole area ...
5
votes
1answer
99 views
Comparison of three contour lines
I am looking for a way to spatially quantify the difference between three contour line shapefiles. More specifically, I have two elevation rasters which I intend to create contour lines from, but ...
2
votes
2answers
170 views
Losing large portions of elevation contours from QGIS to PDF
Please forgive me as I'm new to GIS and all this might be a silly question, the wrong place for this question, or a hack way of going about what I'm getting at. So any suggestions on better practice ...
1
vote
2answers
443 views
Interpolation of contours (from one “main-contour-shapefile”)
I calculated, that the best and smalest possible äquidistance (equidistant) for my map is 30m. After I generlized my DHM, I extracted contours of a intervall of 30m and smoothed them. Now I have my ...
5
votes
2answers
93 views
Using field calculator to delete specific contours
I have 3 contour shapefiles with 25m, 50m and 100m equidistance. Now I want to delete in the 25m-shp-file every **50m and **00m contour and in the 50m-shp-file every **00 contour. How can I show them ...
3
votes
1answer
2k views
How to crop raster layer?
Can anyone tell me how to crop a raster layer in QGIS? I want to make contours from a section of a layer, and including the whole layer will create far more data than I need and slow down the ...
3
votes
1answer
862 views
Create filled contour map with GRASS
Background
I'm trying to make contour/isoline/isochrone maps to show what areas are within walking distance to schools for my pet project to help with the Safe Routes to School program. I followed ...
