0
votes
1answer
28 views

Merging vector layers using QGIS? [duplicate]

I have dozens of vector layers that I want to join together in QGIS. They have identical fields. How do I do this?
1
vote
1answer
35 views

Merge two geojson files

I have a global json files about countries' boundaries but the Russia is in two parts (two polygons). I want to merge the two parts in one, without the boundary at the middle. Is there a way to ...
0
votes
1answer
55 views

Possible to run “Merge shapefiles to one” algorithm from Python script?

Developing a python script in QGIS 2.2, I can run algorithms from the Processing plugin fine such as those from QGIS geoalgorithms and SAGA. Can you do the same for the algorithm "Merge shapefiles to ...
0
votes
0answers
56 views

How to keep all the unique columns of the shapefiles after merge?

Writing a script where the user is asked to select a directory which contains Folder_1 and Folder_2, both containing shapefiles and run various algorithms. The basic logical process of the script is: ...
2
votes
3answers
85 views

Can QGIS merge CSV files with different colums? [closed]

I am trying to merge a month's worth of daily CSV files without using ArcGIS. Each file has ~25,000 entries so this is a high data load project. Sample data can be found here. Note that we are using ...
0
votes
0answers
7 views

QGIS merge selected features tool malfunctions due to geometrical errors

The issue occurs using the 'Merge Selected Features' tool when there are geometrical errors in the features (not all are picked up by the 'check geometrical validity' tool). In 2.2 Valmeria, the ...
0
votes
1answer
74 views

How to create a grid after merging shapefiles?

Follow up question to QGIS Model Builder Script - Possible to merge layers in a folder? I think I'm missing something very obvious here but can't seem to find it. After merging shapfiles in a folder, ...
1
vote
0answers
39 views

Merging shapefiles to one, rearrange columns?

I am trying to merge two shapefiles which both contain polygons representing properties in QGIS 2.2. One problem is that the names of some of the columns in the attribute table differ between the two ...
2
votes
1answer
112 views

How to merge hundreds of vector layers and sum attributes in QGIS?

I'm still at a fairly beginner level with QGIS and I've been banging my head against the wall trying to figure this out, so I would like to turn here for the internetz help. I am trying to construct ...
7
votes
3answers
233 views

Merge images first, or georeference first?

I'm wanting to georeference and vectorise some features from scans of the OS 1896 Town Plans that I have purchased from the NLS (http://maps.nls.uk/os/london-1890s/info.html). The scans provided are ...
3
votes
2answers
121 views

Merging DEMs of different grid size

I'm trying to merge two grids with different cell size. One has a cell size of 10m and the other 50m. The 10m one covers a subarea of the 50m one. I know that the most accurate one is the 10m one and ...
0
votes
3answers
64 views

How create geographic column in postgis table?

I merged several point shape files in postgis, but when I load the new merged shape in QGIS it is not possible to see points in the main window. To create the merged table I used this piece of code ...
1
vote
1answer
79 views

QGIS 2.2 Raster Merge losing color data

I'm trying to merge a couple of GeoTiff maps using Raster > Miscellaneous > Merge but the merge is only coming out in grayscale. The geotifs are using palettes color. How do I get the merge to keep ...
1
vote
1answer
207 views

Merge multiple geometry type TAB files in QGIS/OGR

I have a number of vector layers with all types of geometry (point, line/multiline, poly) and I want to combine them into a single layer in QGIS. I know MapInfo can do it but with the other 99% of my ...
0
votes
2answers
137 views

Batch merge large numbers of.asc grid files

I have >2.5k .asc grid files which I need to merge into a single overarching dataset. I would like to avoid having to convert them into esri grids first so was looking to use QGIS (v.2.0). I am ...
1
vote
2answers
275 views

How can I create a merged buffer in QGIS then count points that fall within it

I have a QGIS plan which shows ponds (as points in a shape file with an OS tile as a background) within a survey area. I need to calculate the total number of ponds within 1 km of each of the on-site ...
2
votes
4answers
167 views

Merge large number of polygons using QGIS

I have a series of polygons that are the output of another GIS program - I need to merge the polygons into a single polygon. I have tried a couple of different methods with no luck. I have tried to ...
2
votes
1answer
60 views

How do I create smaller maps for publishing from multiple tiles representing a large map using QGIS?

I am completely new to cartography and QGIS - I'm a writer, editor and acceptable designer (Adobe Creative Suite). I wish to produce PDF tour guides featuring maps that display a route. One version ...
2
votes
2answers
112 views

Merge point features within a given radius [duplicate]

I have a file in QGIS with 5000 points. Some of the points are really close to each other (5m). How can I cluster the point features to one point feature if they are within 5m? The new points should ...
1
vote
1answer
49 views

Merge two vector layers with different granularity

Beginner at QGIS here. I have two vector layers. One represents country boundaries for the whole world. The other one represents region boundaries, but only for OECD countries. I would like to ...
0
votes
1answer
79 views

Merging Multiple Paths

Alright, I'm going to start by using Google Earth terminology because that's where the original need for a solution came up. I have multiple paths (54) that I want to merge into a single path. ...
1
vote
2answers
2k views

How to Merge/Dissolve Polygons By Common Attribute Field in QGIS?

I have joined corresponding Local Enterprise Partnerships table data into a polygon shape file containing UK Local Authorities. How do I Dissolve or Merge the the Local Authorities polygons by ...
0
votes
0answers
92 views

How to merge raster quadrangle tiles in qgis?

I've downloaded some dem tiles from here http://www.granit.unh.edu/data/search?dset=dem/dem174, which I'd like to merge into a single smooth digital elevation model usinq QGIS. So far I've tried ...
1
vote
1answer
57 views

problem in merging adjacent address polygons in qgis

I am having 15 polygon shape files of a sub locality of a city that is having address in their attribute table. I want to merge these polygons based on the address in the attribute table?how can i do ...
0
votes
0answers
67 views

QGIS merge rasters error

I've been trying to merge some raster tiles at work and I've been getting an error message saying I don't have the correct permissions. This works fine on my home pc. Any obvious reasons for this? ...
0
votes
0answers
66 views

Can't use the advanced digitizing tools?

I'm trying to merge some selected features on QGIS with the Merge Selected Features tool of the Advanced Digitizing tools Menu, but I can't. They're gray, not colored and I cannot click on them. How ...
0
votes
1answer
280 views

How to batch merge rasters using FOSSGIS tools?

I'm working with QGIS 1.8 (gdal 1.9.2) and GRASS 6.4.3...but on Windows 7. I "just" want to merge my raster. I've got a folder with 50 GTiff raster from Lidar data. The aim is to merge raster ...
2
votes
2answers
386 views

Merge lines with the same 'name' attribute on QGIS?

I have a shapefile with a few thousand lines, each is a street segment. I'd like to merge all features with the same 'streetName' attribute into a single attribute. I only really care about the name ...
0
votes
0answers
53 views

Unwanted lines when cutting & merging polygons

I am using QGIS version 1.8.0. Sometimes when I cut or merge polygons I get unwanted lines left in them. On zooming in to them they do not appear to be slivers. Is there a way of getting rid of these ...
0
votes
1answer
2k views

QGis: Merge intersecting polygons into one which are part of the same feature

I'm not a GIS professional so I hope I use the correct wording, at least I hope you understand my question. Let's say there are 5 polygons in the feature A. In the shape file there are more ...
1
vote
1answer
186 views

How to create a 4 band image from an RGB and a grey scale image?

I have an RGB image and a Gray scale image. I would like to merge them in a 4 bands image. How can I do that? Is there a simple way to do it from QGIS or I have to modify the image before to load them ...
3
votes
1answer
446 views

How to merge Waypoints from many GPX files?

I have a large number of Waypoint-layers (gpx) and would like to merge them. Is there a way to do so using QGIS? Thank you!
1
vote
1answer
224 views

How to “Merge Selected Features” with python?

I have been looking for the answer to this question for some time now, but can't seem to find it! My problem is straight forward: I have one layer It contains lots of features (only polygons), say ...
1
vote
2answers
115 views

How to make digitization more detailed afterwards with QGIS?

I digitized already two areas, bordering each other on one side. Than I realized, more detail was needed! What do you suggest as a fast way to do so? Adding each time new dots/verteces takes so ...
3
votes
3answers
108 views

Automated way to join

I have river networks (polyline) of several adjacent countries as shapefiles that almost match up at the borders, but not quite. Is there any way to automatically connect them to a consecutive river ...
-1
votes
2answers
190 views

styles when merging shapefiles in qgis

Trying to create something for mapstory.org It wants it in all one shapefile. So I create a polygons and lines (with time attributes) in qgis 1.8 Then merge them all into one shapefile, how can you ...
4
votes
1answer
222 views

How can I avoid reprojection gaps when merging DEM rasters?

I have two raster DEMs in same resolution I want to bring together. I was using the merge-function in SAGA, GRASS and QGIS but I always get the following result: What do I need? Where could the ...
1
vote
1answer
235 views

Merging data in Quantum GIS

I have a set of postcode boundary data that currently goes down to the most detailed level possible, like this: AB1 2CD I would like to 'simplify' the data so that it just shows the first part of ...
5
votes
0answers
129 views

How to add shapefile name as attribute during merge? [duplicate]

Possible Duplicate: How to add field with filename when merging shapefiles with ogr2ogr? I have more 200 shapefiles with a unique name. I would like to merge all of these together and save ...
5
votes
2answers
346 views

Extract certain area of contours/satellite images

I have 2 satellite images (jpeg2000 format) and 2 xyz-files from the same area. I am trying to extract certain region from the area including contour lines and the satellite image in order to import ...
2
votes
1answer
66 views

Is there a version of merge in QGIS that works like “Difference”?

I can't seem to find a tool to merge files from the active TOC into one file... The datamanagement --> Merge Shape files only allows you to choose a directory of shapefiles to merge which is really ...
4
votes
1answer
2k views

How do I edit shape file attribute tables so they all have the same information?

I am trying to merge several pipeline shapefiles using GEOMERGE but it cannot complete the function because they have different column definitions. So I need to edit the attribute tables so that ...
2
votes
1answer
584 views

merge raster images: error message procedure not found

I am using QGIS 1.8.0. Whenever I try to merge raster images I get the following error message: Traceback (most recent call last): File "C:\PROGRA~1\Quantum GIS Lisboa\bin\gdal_merge.py", line 36, ...
3
votes
2answers
616 views

How to join lines in QGIS for later using “lines to poly”?

After successfully merging lines (using snapping) with merge_selected_features i got nice result - one merged line. Next thing was to make polygon from created merged line. Result is not nice - it ...
4
votes
1answer
789 views

merge selected features and programming

I have a shape file with UK districts and unitary authorities. In the past, using commuting patterns, I worked out a new geography which is close to travel to work areas. I now would like to create a ...
9
votes
2answers
9k views

How can I join several raster files using QGIS?

I'm new to QGIS. How can I combine multiple raster layers into one layer? The raster images are of different areas with very little overlap. The goal is to bring numerous town plats into one project. ...
7
votes
4answers
2k views

Open source software to merge large shape files

Some background: I have 2 polygon shape files with approximately 500,000 records each. The two files are identical in terms of field structure. Using ArcGIS 10.0 I can'nt merge these two files using ...
1
vote
3answers
2k views

What is the problem with the merge shapefiles tool in QGIS?

I'm having trouble merging shapefiles in QGIS. I'm using plugin ftools 0.6.1 and I get this: Any workarounds someone may know of? Thanks