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Questions tagged [merge]

To combine two or more parts into a larger whole.

124 questions with no upvoted or accepted answers
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77 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
votes
0answers
24 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
votes
0answers
333 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
1answer
101 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
77 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
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0answers
397 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
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0answers
115 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
287 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
244 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
665 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
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0answers
408 views

Image classification for a study site falling over two adjacent Landsat 8 scenes (qGIS or ArcGIS)

This question concerns work-flow rather than specific methodological problems. I will be using GRASS to classify Landsat 8 images to create a vegetation map for a study site that happens to fall over ...
3
votes
1answer
49 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
0answers
31 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
votes
1answer
49 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
33 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
134 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
97 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
100 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
183 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
172 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
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0answers
505 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
152 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
51 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
126 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
135 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
119 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
107 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
306 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
236 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
votes
0answers
878 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
237 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
472 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
votes
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
vote
0answers
57 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
24 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 ...
1
vote
0answers
29 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 ...
1
vote
0answers
28 views

Layer converted into attribute

I am using QGIS 3.8. I am creating a geological map, and because I wanted to merge two different polygons, it created a separate layer. I want to convert this dissolved layer into the attribute to my ...
1
vote
0answers
14 views

Problem merging/clipping MODIS rasters in QGIS

Im pretty new to QGIS and am having some trouble making a NDVI map for Mali. To cover the whole country I need 5 MODIS NDVI tiles, however every time I try to merge them I get a "the following layers ...
1
vote
0answers
41 views

Fill in gaps in QGIS shapes?

So basically, I've written a script that generates a lot of polygons over the UK with certain criteria. The output it a lot of shapes like the following - I wanted to know if, in QGIS, I'm able to ...
1
vote
0answers
38 views

Merging lines that DON'T touch in PostGIS?

After a specific demand in my work that needed to create a single line from two untouched geometries (lines), I needed to develop a function and follow for contribution: Passing as a parameter two ...
1
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0answers
25 views

QGIS How to retain symbology when merging layers?

I have a QGIS project with various layers for which I have assigned icons. When I import additional data layers and then merge these layers with the existing layers (and their symbology) a new layer ...
1
vote
0answers
21 views

Editing errors in shapefile

qgis version: 3.4.9-Madeira I am editing a shapefile. I want merge two adjacent polygon. Then, I run merge tool, and it comes like below picture. You can see some gap(?) or tail shape line between ...
1
vote
0answers
24 views

Merging satellite images error

I am trying to merge 3 satellite images of 3 times. The images are median images. I have used the following code but there is an error. var maskL8 = function(image_m) { var qa = image_m.select('BQA'...
1
vote
0answers
31 views

Tabulating points from CSV that are within 1 km of points from another CSV using QGIS?

I have two sets of data. One that is from a csv and contains a relatively small amount of data (we will call location data), and another csv that contains a larger dataset that contains environmental ...
1
vote
1answer
133 views

Merge connected lines and split them after set unequal distances

I need to edit line features in QGIS 3.4.4. I have more than 1000 line features that I want to first merge and then split. The line features describe roads in useless intervals, my goal is to ...
1
vote
0answers
206 views

Python: No module named 'gdal_merge'

I try to merge two DEM data sets with python, using gdal_merge, but it doesn't work. I install like this: from osgeo import gdal But this doesn't work: import gdal_merge as gm I get the error ...
1
vote
0answers
148 views

could not find function “merge_eurostat_geodata”

Just a couple of codes with the same error at the time of merge data: FIRST CODE: library(eurostat) library(dplyr) library(ggplot2) library(stringr) fer <- search_eurostat("fertility") ...
1
vote
0answers
32 views

Merging bunch of tracks into fewer?

The following OverpassTurbo query for train routes in Sicily, Italy, returns ten's of tiny tracks: [out:json][timeout:25]; //Sicily: 39152 rel(39152);map_to_area -> .searchArea; ( node["...