Questions tagged [merge]

To combine two or more parts into a larger whole.

135 questions with no upvoted or accepted answers
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votes
1answer
86 views

Merge/join only the lines which are snapped to vertices in QGIS

I have polygons drawn with AutoCAD as Mline (Multiline type) which are rendered in QGIS as 8 segments for each feature. An example of one selected feature is shown in the picture below: I want to ...
5
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0answers
82 views

“Merging” 2 layers of LineString with splits at intersections

I would like to "merge" 2 networks of lines and these lines need to be split when they intersect. With pictures it should be clearer : What to do: if a black line intersects a red line, they should ...
4
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0answers
55 views

QGIS geometry error:Hole lies outside shell

I am using QGIS 3.8 and I am using a layer from OSM of Tokyo city. The layer is consisted from many polygons and I have tried to merge it but I got error. This is how the original layer was look like:...
4
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0answers
40 views

Difference between merge and create virtual raster

I have the DEM of a defined region that has been split into sub-DEM with a resolution of 1 km x 1 km. When I merge the sub-DEM to create a single DEM (Raster -> Miscellaneous -> Merge), the overall ...
4
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0answers
357 views

Merge line segments by length (in QGIS)

I have a layer containing line segments which are connected by their endpoints (e.g. as within a street network). I'd like to merge (union) polylines within this layer into one feature until following ...
3
votes
2answers
51 views

How to merge overlap polygon respectively in one shapefile in QGIS

I want to merge the polygons of one shapefile if they overlap, but I don't know what to do. I try'dissolve' but get only one final polygon. This is not what I need. I want to merge them respectively.
3
votes
1answer
174 views

Merging many rasters with Python script within QGIS using GDAL?

I have many rasters that im trying to combine in order to produce contours. They are in the .bil format so I understand that i need to translate them using gdal first but none of my attempts have ...
3
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0answers
91 views

QGIS - Parallel Lines - Count length of one

I have a large layer of lines (telecommunication duct) with in parts several parallel lines that are close to each other (cause they lay in the same trench). I would like to count the length of the ...
3
votes
0answers
481 views

Merging asc files in QGIS?

I am trying to merge 8 .asc files using merge option in QGIS 2.4 but when I do that it makes like contour of the file when I want to merge the files together. .ASC Files: Result after merging:
3
votes
0answers
128 views

Tool for merging OSM and Google route data

I'm using google API in order to solve a routing problem; by giving it points of source and destination and demanding the route. Now I want to project the route on an OSM map. Is there any tools to ...
3
votes
0answers
63 views

How can I merge roads layers that do not align perfectly?

I have multiple roads layers for a given area and would like to merge them into one layer since they each have some unique roads the other layer does not show. However, the roads that these layers ...
3
votes
0answers
292 views

Keys for merging US state/county ANSI's with GADM Unique identifiers?

I've got county-level data from USDA NASS, and I want to merge it with gridded climate data. A preliminary step is the associate the counties with the coordinates of their centroids. If I merge by ...
3
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0answers
246 views

Create polygons from many small. Expand to include space between

I'm just a programmer without GIS-skills as such. Hence this question: Intro: I have a lot of polygons; actually each private-owned real estate in my country. I also have "counties" as polygons. In ...
3
votes
0answers
677 views

How can you calculate the union/merge two polygons with ogr2ogr?

I want to calculate the union/merge two overlapping polygons using ogr2ogr (as I have 300+ to do). I want the output to be the same as you would get if you used the 'Merge shapefiles to one' command ...
3
votes
1answer
56 views

Nodata value making holes in merged GeoTIFFs in QGIS?

I am trying to remove black borders around the edge of a GeoTIFF. The Black border around the GeoTIFF has an RGB value of (0,0,0). I have tried assigning 0 as a "No Data" value to the tiff, but QGIS ...
2
votes
1answer
60 views

Automated Merging using ArcMap

I’m new to working on automating processes with GIS data and I’m trying to come up with a solution in ArcMap that will automate merging polygons that have “Shape Area < 25” into larger polygons. I ...
2
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0answers
39 views

QGIS raster tool closing on parameter input

I'm trying to run the Merge tool on some rasters using Qgis 3.8 and when I add the layers as inputs, the tool just automatically closes... everytime, no matter which parameters I'm checking or ...
2
votes
1answer
56 views

QGIS (merging, dissolve, union) lines of same name

I have street data where roads are segmented for no particular reason. I want to merge, dissolve or union whatever seems fit to make a single flat line. I H have tried above processes in QGIS but ...
2
votes
0answers
37 views

Merge two reflectance layers in QGIS

I currently have two Landsat 5 reflectance value layers that were calculated from the per-processing function in SCP for QGIS. I would like to merge these two images together to create one mosaic ...
2
votes
0answers
141 views

Set a rule for grow region in eCognition

I am using the grow region algorithm in eCognition sofrware in order to merge my candidate class. I want to set the rule : two candidated objects are merged only if the length/width ratio of the ...
2
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0answers
101 views

Dissolve by Class in eCognition?

I have a lot of numbered classes in my eCognition project (version 9.0.1), which contains approx. 2 Mio. segments. All segments have been assigned to a class and now I want to merge them (basically do ...
2
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0answers
113 views

Run graphical modeler on multiple pairs of selected features

I have a shapefile of 10,000+ county polygons. Of these, I've identified ~5,000 that are geographically too small, and I want to combine with their immediate nearest neighbor, naming the combined ...
2
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0answers
194 views

Determine Geometry of Multiple Layers in QGIS

I am sure this is a newbie question. I am importing a large number of layers into QGIS from a complex .kml file and need to combine into a single layer and finally save as a .shp file. I repeated ...
2
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0answers
187 views

How to merge large number of vector features with QGIS SingleToMultipart?

My goal: Merging all line segments in a vector to a single feature. My approach: QGIS module singlepartstomultipart My problem: For larger numbers of features within the line vector, the module ...
2
votes
0answers
566 views

Problem merging polygons in QGIS

I've got a polygon shapefile with 11 features (11 Italian cities) and I want them to merge them into one, however I cannot activate the "Merge selected features" button. Any suggestion about the ...
2
votes
0answers
153 views

QGIS 2.8 & Python: Merge problems using Python

I have 9 vector layers that I rasterized. All of these have the same: x;y origin pixel size (1 pixel=1 meter) SRS When displayed separately in QGIS these 9 rasters are superimposed correctly but ...
2
votes
0answers
52 views

Aggregating census tracts and reducing Coefficients of Variation?

I am working on a project that maps out poverty rates (ACS data) by census tract. Many of the tracts have CV's that are just too high for our study and I am hoping for find a sound methodology in ...
2
votes
0answers
129 views

difference in behavior between merge from SAGA and merge from QGIS geoalgorithms

I'd like to know what I'm doing wrong with the merge algorithms in Python. I have several shapefiles (polygons) ending in 'LNA', 'LNC', 'LDA', and 'LDC', and I'd like to merge them depending on ...
2
votes
0answers
140 views

Layer Stack 6 Landsat8 bands

I have 6 images from Landsat 8 (Green,Red,NIR,SWIR1,SWIR2,NDVI). When I want to layerstack them with "Merge" I always get a result tif which is just black and white, however I can see that all 6 bands ...
2
votes
0answers
124 views

Joining 2 vector pieces of one country into one vector polygon using QGIS?

How to eliminate seam on meridian 168W. Seam is on Russia and Antarctica? I have done my projection in this way: QGIS display world country shape files centered on pacific ocean using Robinson, ...
2
votes
0answers
109 views

Fixing undesirable lines between tiles from SRTM contour line extraction?

I'm trying to make a South American topography map based on SRTM data on QGIS. The problem is a visual one. If the topography contours are extracted from individual SRTM tiles, it results a little ...
2
votes
0answers
310 views

How do you merge overlapping .asc files in QGIS with topography and bathymetry?

This is my first time trying to manipulate GIS data. I have two files. The first is higher resolution (SRTM) topography data for a region of islands (the Caribbean), I don't know what the surrounding ...
2
votes
0answers
238 views

Merge vector layers problem with german names (ä, ü, ö…)

When I'm trying to merge (saga merge layers tool) some shape files I get an error log 'ascii' codec can't decode byte 0xfc in position 91: ordinal not in range(128) See log for more details Log:...
2
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0answers
902 views

Merge multiple geojson-polygons

Lets say I have a very big image With a polygon in it: I want to polygonize this very big image with gdal polygonize. But the image is too big, so I dont have enough memory to polygonize that ...
2
votes
0answers
111 views

How to union linestring data distributed on multiple layers?

I have four shapefiles. Each contains a linestring as shown in the image. Each shapefile is represented as its own layer in QGIS. I would like to union these linestrings into one polygon which ...
2
votes
0answers
248 views

Trouble merging 2 rasters using qgis

I am trying to merge two rasters using the "merge" tool on Qgis 2.6. Qgis does complete the process, but the resulting image only shows one of the two rasters with the rest of the extent with really ...
2
votes
0answers
476 views

Merge Raster Layers with Raster Calculator

I am looking to merge three raster layers together, we are only allowed to use the Raster Calculator tool in Spatial Analyst, ArcToolBox. Using ArcMap 10.2
2
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0answers
24 views

Processing Toolbox, avoid using empty layer

I have a process (on the processing Toolbox) I need to reproject and merge two layers (result of previous operations). Sometimes, one of these layers will be empty, in that case it is not necessary to ...
1
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0answers
13 views

How do I build a virtual raster to merge goetiff tiles?

I am new to GIS and I want to merge geotiff tiles to one raster tiff. Here is the source to the xyz files: https://www.opengeodata.nrw.de/produkte/geobasis/hm/dgm1_xyz/dgm1_05314000_Bonn_EPSG4647_XYZ....
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0answers
38 views

Is it possible to merge multiple polylines into one

I have vehicle GPS coordinates of the route. In my case vehicles can drive through one road multiple times, so overall it can look like round trips. Is there any way to merge two traces into one, so ...
1
vote
0answers
37 views

Merging and snapping shapefiles

I have several large shapefiles from various sources. All cover various sections of oceans and many overlaps, as such the coastline is repeated across the several shapefiles but to varying levels of ...
1
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0answers
38 views

Unable to Merge Multiple .DXF Files and Output .DXF Using Merge Vector Layers

I'm using QGIS 3.8.3 with GRASS 7.6.1 to merge multiple .dxf files into a single .dxf file. When I attempt to use the Merge Vector Layers via Vector>Data Management tools>Merge Vector Layers, I get ...
1
vote
0answers
46 views

Merging three different rasters

I am using QGIS 3.8 and I am trying to merge three rasters according to the scheme pictured on the attached screenshot. I tried many syntax expressions for the Raster calculator but I was unable to ...
1
vote
1answer
9 views

Eliminate line sections in a merge to use Qchainage plug in

in QGis I merged several layers, each containing sections of a road, to show a longer route on a map. Now when I want to use the qchainage plug in the plug in starts the count over again in each '...
1
vote
0answers
31 views

Merging features from different layers by field value in QGIS

I have various layers with polygons which each represent a land use class (e.g. "roads", "vegetated terrain", "water", etc.) These layers have fields which further classify the features' land use (e.g....
1
vote
0answers
68 views

Merge *.png files into one using GDAL

I built a Python script that downloads tiles from some map service. This service cannot be imported to QGIS as a tile layer so I decided to download tiles directly using requests module. The script ...
1
vote
1answer
43 views

How to specify fields to use in a merge

I am using arcpy to merge multiple feature classes from a list of feature classes. They all have the same fields. Let's say they all have the fields = ['CO_FIPS', 'MILES', 'FLOOD_ZONE', 'VALID', '...
1
vote
0answers
32 views

Union multiple layers with OGRVRTUnionLayer

I'm trying to union overlay layers using OGRVRTUnionLayers. However, it keeps the new records on new rows as opposed to appending the data to the same row (So you would expect to get back all data but ...
1
vote
0answers
64 views

Using ModelBuilder to tabulate area of overlapping buffer zones in ArcMap

I'm looking into how much open and close canopy falls within given buffer zones. My buffer zones are a polygon layer created from point sites, but canopy data is a raster with 2 types of data, open or ...
1
vote
0answers
32 views

Bad Result when Merging Rasters

I'm trying to merge 9 raster files I have. for some reason. if I merge a few of them it works, especially when they are close to each other. But whenever I try to merge all of them, together I get ...