All Questions
33 questions
2
votes
2
answers
2k
views
Dividing shapefile into multiple shapefiles using an attribute value in QGIS Graphical Modeler
I have a shapefile with a column that have project references, I want to create a different shapefile for every project reference there is.
Note that the project references are not unique in the sense ...
- 221
2
votes
0
answers
259
views
Updating set of attributes on vector layer from .csv table?
I have over 1,000 records in a .shp file, all with a unique ID field (LINKID), along with many other fields containing data (TXTFLD1, TXTFLD2, INTFLD1, INTFLD2, etc).
These records have been copied ...
4
votes
2
answers
700
views
Can not open shapefiles from QGIS 2.18 in MapInfo 16.0, projection was missing
I am working with QGIS 2.18 where I do have several shapefiles in EPSG 4326 and encoded in ISO 8859-1, see image below.
I can check their geometry state for instance with Geometry Validator or Check ...
- 34k
8
votes
1
answer
791
views
The longest straight line (L) within a polygon and the longest perpendicular line (T) to L
I'm mapping elongated glaciological features within QGIS 2.18.22 and I need to measure the longest straight line (L) and the longest perpendicular line (T) to L (as illustrated in the picture) within ...
- 81
1
vote
0
answers
2k
views
QGIS 2.18, gives Invalid Data source
Using QGIS 2.18.14, add vector layer, open a shapefile, gives:
Invalid Data Source: FILE.shp is not a valid or recognized data source
This FILE.shp was OK on QGIS 2.12. Same result for other .shp ...
1
vote
1
answer
4k
views
Extract Polygon Coordinates from Shapefile data
I have some building data (polygons) as a shapefile in QGIS 2.18. I'm trying to add a location coordinates (the polygons rough center) and an array of the polygons coordinates (its points). I've been ...
- 113
1
vote
0
answers
318
views
How to merge USGS contour data from files into state?
Long story short, I'm looking to take 1/3 arc-second 1x1 degree contour shapefiles from the USGS National Map Viewer and transform that into a contoured map of a particular state, but am encountering ...
- 111
1
vote
2
answers
874
views
Export unique values from QGIS layer column [duplicate]
I have a shapefile loaded into QGIS.When i apply filter i can quickly see all the unique values in that column. Is there a quick way to extract that for use in code? I know i could load the shapefile ...
- 1,512
3
votes
3
answers
1k
views
Merging island into simplified polygon [duplicate]
I have a polygon shapefile with holes (representing Islands and Rivers) within it as seen below:
I need an automated way to fill the polygon in QGIS as seen below: That is remove all Islands and ...
- 748
1
vote
1
answer
1k
views
Opening location folder for data files using QGIS?
I am working in a corporation that publishes maps with ArcGIS but I use QGIS for working with data. I need to find the data files that show the information I want to publish and quickly send them via ...
- 565
0
votes
2
answers
893
views
QGIS 2.16.3 crashes when trying to dissolve any shapefile
When I try and use the dissolve tool (vector>geoprocessing tools>dissolve) QGIS 2.16.3 crashes and produces a minidump file. This is with any shapefile that I use. I have also tried it on a friends 2....
3
votes
1
answer
174
views
Not able to use "Save" button in QGIS's Table Manager
I'm getting a message that says "Failed backing up the old table to..." when I use the "Save" button Table Manager after deleteting fields from a shapefile. It says I should use "Save As..." instead, ...
- 611
1
vote
0
answers
44
views
Why do polylines digitised disapper when I save the layer. Would the shapefiles be corrupt?
I have a problem with QGIS 2.2. When I digitise a polyline layer and save the edits the lines disappear from the map. This does not happen for the polygons in the same GIS project. The points are ...
- 141
15
votes
7
answers
62k
views
Shapefile layer no longer editable (toggle edit option greyed out) in QGIS
I am using QGIS 2.16 / Windows 10.
I have a point shapefile which I have been using for a little while that has always been editable.
Today I was editing the layer, saved my edits and left my ...
- 919
1
vote
1
answer
112
views
Automatic shapefile input for pre-constructed QGIS workflows?
I currently have two models running:
Take shapefiles and break them down into separate shapefiles based on their class, and save them in a specific folder;
Select the broken-down shapefiles with the ...
- 157
2
votes
0
answers
100
views
Label edits disappear upon saving?
I am trying to label a map I'm creating in QGIS v 2.8.9. I'm using data defined labeling to both manually place and rotate labels. I've created the required fields (X, Y, and Rotate) all as decimal ...
- 339
4
votes
3
answers
2k
views
Convert .csv with polygon geometry to .shp QGIS
Working on a Mac in QGI 2.12, I have a csv file with polygon geometry coordinates that I would like to save to a shapefile. It displays fine as a csv. However, when I try to use "save as," I get the ...
- 41
1
vote
0
answers
194
views
pyqgis change or update attribute data with real-time data or Timer update，Memory has been growing
I update my shapefile attribute data by QTimer ,and labling it,
keep the lable visiable,change attribute by 1 minute,
but the Memory has been growing
1
layers =self.iface.legendInterface()....
- 11
1
vote
2
answers
2k
views
Downloading GIS Map for Pakistan into QGIS
I'm looking to add canals and bunds to my raster and have found some GIS maps at:
Canals
Bunds
Bunds Image
Network Plan Map Image - looks to contain both canals and bunds
I'm not clear on how to ...
- 63
3
votes
2
answers
120
views
Qgis feature count increases at save layer edits
QGIS (2.12.3, running on Windows) increases the feature count of a vector layer when I "save layer edits".
If I do the following steps:
create a Vector layer (shp file)
enable "show feature count" ...
- 41
8
votes
1
answer
26k
views
Shapefile/vector layer not appearing in QGIS
I have a shapefile (calling it 'new.shp' for discussion's sake) that won't show up with other layers.
If a fresh file is started and I bring in 'new.shp', it will appear, but any other layers imported ...
- 83
2
votes
0
answers
105
views
How to copy elements and attributes? [duplicate]
I need to copy many elements (and their attributes) from a shapefile and paste to another one. If I use copy/paste functions it pastes only the polygons but not the attributes.
How can I solve it?
- 1,313
1
vote
0
answers
67
views
QGIS 2.10 Edit shapefiles saving only once
I'm have some trouble while editing my shapefiles. I can save only once.
So what I have to do is to save as another file, add to QGIS and edit again. Save as another file... And on and on...
Does ...
- 11
1
vote
0
answers
51
views
Join tables in QGis 2.01. Dufour
I performed a "join" going to the properties option in a shapefile (in this case is just a table), in order to join the attributes from another shapefile that has a field in common, specifically "...
- 11
1
vote
0
answers
819
views
Joining shapefiles based on FID in QGIS [closed]
I want to join shapefiles (or a shapefile and a data file) based on their mutual FIDs and can't see the FID in the "Target Field" dropdown on the join form.
I believe this is a basic need to have ...
- 31
1
vote
1
answer
382
views
How to have newly added lines split existing lines where they intersect, using QGIS
I have a line shapefile where the lines form a closed polygon. Using QGIS (2.8 on OSX 10.7) I would like to add lines to the layer, basically splitting the polygon into quadrants. Then, I will need ...
- 201
8
votes
1
answer
25k
views
Creating shapefile from Excel file in QGIS?
I am using QGIS 2.6.1 and have worked in an Excel file database (which was actually converted from a Shapefile). I have managed to convert it as CSV file and load it into QGIS (displays data fine) but ...
- 81
2
votes
0
answers
155
views
SHP, SHX and DBF files became empty (zero byte) overnight on QGIS [closed]
This literally happened overnight. I was working on a shapefile in QGIS 2.4 last night but my files (SHP, SHX and DBF) all become zero byte this morning.
If this has happened to anyone before, how ...
2
votes
1
answer
334
views
Merging more than two shapefiles in QGIS
I want to merge 9 shapefiles (all polygons) into one file.
The problem is, when I try to merge more than two files at once, I seem to loose attributes on the way? Is there any other way of merging ...
- 867
3
votes
1
answer
2k
views
Converting CSV file of WKT data to shapefile using QGIS 2.01
Is it possible to create a shapefile directly from a CSV WKT file in QGIS 2.01?
WKT
POLYGON(...)
POLYGON(...)
Save as shapefile doesn't seem to work.
- 51
3
votes
1
answer
620
views
OTB vector segmentation result is flipped
I'm using Monteverdi 2 to perform a mean shift segmentation on an image of an archaeological dig, to test the feasibility of automatic detection of elements.
I've loaded the image in Monteverdi and ...
- 8,718
1
vote
1
answer
128
views
not all polygons showing up in qgis 2.0
I am working with the block group shp files that I got from tiger 2010. When I bring in the shp files some of the block groups show up, but this is spotty.
I have adjusted the CRS and still nothing.
...
- 637
1
vote
1
answer
330
views
Adding new vector layer. Should .shp file only be added or .shp plus corresponding .shx, .dbf, etc.?
I am a very definite QGIS newbie. I have been creating a map using files that had been used in ArcGis. Each time I wanted to add a new vector layer I opened an .shp file and specified CRS as WGS 84. ...
- 49