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location Potsdam, Germany
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visits member for 3 years, 2 months
seen 16 mins ago

Jan
23
comment How to cut multiple neighboring raster images
Sorry for the delay. It took some time to get OTB up and running in my office QGIS installation. Sadly, the "split image" tool only seems to split a multi-band image in several single-band images with identical extents. It does not offer any options to cut a single raster image into e.g. quarters (which is what I need).
Jan
9
comment How to cut multiple neighboring raster images
Hm, the tutorials I found turned out to be less helpful than expected, and I'm haven't really used scripting before. I'm also not quite sure if I'm using the right terminology in my search. What I'm trying to achieve is more or less "reversed mosaicing", how would you call this process? "Clipping" is almost always used synonymous with "cropping" in my search results, and I don't want to crop anything away... I'm a bit lost right now.
Jan
9
comment How to cut multiple neighboring raster images
I need to cut about 40 raster images (sized 1x1 km) into 160 images (sized 500 x 500 m) without reducing the resolution. Some sort of batch process would really help, I just don't really know where to look. All tutorials I could find just address cutting a single larger image into smaller pieces, e.g. with vector lines.
Jan
8
asked How to cut multiple neighboring raster images
Jan
6
comment How to create labels using 2 columns?
You can also concatenate directly with "field1" || "field2".
Dec
13
comment how to fix greyed out edit button
@Jo Pedder: You can choose to show just a subset of features defined by an expression. You can set this up in the layer properties, "General" tab --> "Feature Subset". Just click on "build query". But I guess this wasn't your problem, then.
Dec
11
comment How to remove vertices or lines within a polygon?
Oh, I didn't mean to create a duplicate answer. Just started to type it, and got distracted for a while, so Alexandre Neto beat me :)
Dec
11
answered How to remove vertices or lines within a polygon?
Dec
10
comment how to fix greyed out edit button
Did you create a feature subset in your layer properties? I think this will grey out all edit buttons.
Nov
29
answered How to change the aspect ratio of a map without the scale changing?
Nov
26
comment QGIS, making a topo map from an excel file
@Eyal Saiet: Did this work for you?
Nov
25
revised QGIS, making a topo map from an excel file
replaced image
Nov
25
answered QGIS, making a topo map from an excel file
Nov
13
comment How to update file locations in QGIS projects?
I didn't know you could update multiple layers with a common directory at once. Thanks!
Oct
18
awarded  Citizen Patrol
Oct
17
comment How to reproject EPSG:102218 with QGIS?
If you geodata comes with a projection attached (georaster, .prj file, etc.) that is not in the EPSG catalogue QGIS will set up a custom projection called "USER:XXXXXX". This will work just like any other projection from the EPSG list, as long as the definition is correct.
Oct
16
comment How to select features with NULL Geometry from Shapefiles?
I don't know if this works (don't have a shapefile with NULL geometry at hand), but can't you just add geometry columns and then delete all featues with an area of "NULL" or "0"?
Oct
14
answered Why are font and line sizes different in QGIS's Print Composer and how do I normalize them?
Oct
10
comment How to add csv file in QGIS 2.0 using Delimited Text Layer Plugin?
Hm. Unfortunately I only have good old QGIS 1.8 installed here at the office, and not 2.0 yet - otherwise I'd give your data a test run myself...
Oct
10
comment How to add csv file in QGIS 2.0 using Delimited Text Layer Plugin?
But your coordinates use a colon as decimal separator (you have '120.4833333', not '120,4833333'). What happens if you uncheck "Field optopons" > "Decimal separator is comma"?