3,530 reputation
1516
bio website confound.me.uk
location Caversham, Reading, England
age 73
visits member for 3 years, 2 months
seen 16 mins ago

Nick Hopton is a retired ancient person who's background is in quarrying and ready-mixed concrete. His ambitions include learning more about how to make good maps and becoming an actuarial nightmare for his pension fund.


8h
comment Can't transform lines to polygons
Actually, what you did was very sensible. ogr2ogr (used in QGIS via "save as..") is good at repairing some sorts of broken shapefile.
Oct
17
comment Can't transform lines to polygons
GRASS and I don't get on either, but you can use these functions within QGIS: Processing -> Toolbox.
Oct
17
answered Can't transform lines to polygons
Oct
16
comment How to measure distance between points based on elevation?
"3D" distance compared to flat-map distance? The difference is probably smaller than you might think. Peter Guth, the man behind MICRODEM said "The distance or area will be increased by the secant of the angle of slope, and until you get to very large slopes, the secant is essentially 1."
Sep
14
comment Make a polygon from intersecting lines in QGIS, using Polygonize or similar?
@IanGoddard. Just checking Ian, you have installed Shapely? (python-shapely.) If not, you can install it using OSGeo4W.
Sep
13
answered Make a polygon from intersecting lines in QGIS, using Polygonize or similar?
Sep
11
comment Creating blended colour relief in QGIS?
The method you're using generates hillshade and elevation colours and merges them automatically. It's very quick but it doesn't give you much control and it doesn't produce graded colours. To get the result you are looking for you will need to produce separate hillshade and elevation-coloured layers and merge them. QGIS has all the features you need to do this. I've got to rush, but if someone doesn't come back with answer I'll post some pointers later. N.
Sep
11
comment Creating blended colour relief in QGIS?
There are two or three methods of producing elevation-coloured layers in QGIS, which one are you using?
Sep
2
answered How can you create a depth raster from a DTM and a polygon in QGIS?
Aug
24
revised How to manipulate lidar map using sun azimuth
Added some words
Aug
24
revised How to manipulate lidar map using sun azimuth
Correct typo
Aug
24
answered How to manipulate lidar map using sun azimuth
Aug
16
revised How to upload a series of OS map sheets using QGIS and merge together?
added 10 characters in body
Aug
16
revised How to upload a series of OS map sheets using QGIS and merge together?
Added some text
Aug
16
comment How to upload a series of OS map sheets using QGIS and merge together?
I think the problem is that QGIS can't interpret the TABs properly. I'll add a possible way round this to my answer.
Aug
16
comment How to upload a series of OS map sheets using QGIS and merge together?
That said, I have come across problems with TAB files, historic OS TIFFs and QGIS before. If yours is the same problem there is a way around it, but let me know if you get sensible coordinates first.
Aug
16
comment How to upload a series of OS map sheets using QGIS and merge together?
Okay, make sure the TAB file is in the same directory as the TIFF and them load the TIFF into QGIS. Do the coordinates reported for the cursor as you move it round the screen make sense as OS coordinates? (eg. nnnnnn,nnnnnn.)
Aug
16
comment How to upload a series of OS map sheets using QGIS and merge together?
TABs are the MapInfo equivalent of TFWs and QGIS should be able to use them, I wonder why not in your case. If you load two of your (abutting) TIFFs into QGIS do they align properly?
Aug
16
answered How to upload a series of OS map sheets using QGIS and merge together?
Aug
14
comment How to manipulate lidar map using sun azimuth
Does the file load into QGIS when you go Layer -> Add Raster Layer?