Questions tagged [merge]
To combine two or more parts into a larger whole.
273
questions with no upvoted or accepted answers
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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:...
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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 ...
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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:
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Merging polygons based on percent overlap in PostGIS
Here is a simple representation of my table of polygons:
I want to merge the small polygons to the big ones (if they intersect) and I can't do a simple union because of cases like polygon 1 would ...
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Merging multiple layers in folder with Graphical Model Builder in QGIS 3.10
I am trying to create a graphical modeler that merges all the layers in a folder. I am using QGIS 3.10.12. I saw in some post that there used to be saga:mergeshapeslayer but its not included in the ...
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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 ...
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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 ...
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Value error when merging .nc files: xarray could not find any dimension coordinates to use to order the datasets for concatenation
I want to merge multiple .nc files into one. Each of the .nc files corresponds to a timestep which should be added together to have one .nc file with all data for all dates.
When I execute the ...
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Linked layers / virtually merge layers in QGIS?
I have 20 different regions (let’s say 20 provinces). For each province I have let’s say 50 different attribute tables / layers containing data for the province (roads, bridges, towers, …). I would ...
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Merging multiple LAS files using Python?
Is it possible to merge multiple LAS files into one using Python? Currently I'm parsing LAS data from a website. So the way I'm currently getting this to work is by, getting a bounding box around a ...
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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 ...
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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 ...
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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 ...
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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 ...
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3
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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 ...
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232
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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 ...
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3
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Connecting lines of same name in QGIS
I have street data where roads are segmented for no particular reason. I want to merge/dissolve/union whatever seems fit to make a single flat line.
I have tried above processes in QGIS but every time ...
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48
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QGIS 3.26 - Merge selected features
If I use merge selected features, the rule is that the data is automatically taken from the features with the lowest ID. I know that I can manually choose which features to download data from. But is ...
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114
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Merge the information of two bands in one single "Raster layer unique value report" in QGIS
I have two raster layers that occupy the same area, one for suitability (0-1) and one corresponding to energy output. I merged them keeping separated the information of both layers and now I have one ...
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54
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Joining attributes from more polygons into one
I have a polygon shapefile containing 1047 cities. In the attribute table I have population, area, and population density for each city.
My job is to merge all of the neighbouring cities (their ...
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Merge several topology errors to largest in ArcGIS Pro
I searched first and found people who have come across a similar problem, however, they were trying to solve the errors by creating new features, and the solutions given where aimed at creating, so I'...
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153
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Gaps between tiles after merging
I have some TIFF tiles that belongs to Sentinel 2. I downloaded them by using Sentinelsat library. Their coordinates system is mixed; that is why I need to reproject them for a common coordinate ...
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82
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Combining polygons based on distance matrix in QGIS
I have the following layers in QGIS:
a polygon layer made up of all the zip-code areas in Germany
a layer displaying all the electricity grid nodes in the country.
In a previous step, I created a ...
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2
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Rasterio.merge.merge() does not work
I have 2 .tif files that I would like to merge with rasterio. They have the same crs, are in the same area, and overlap a bit. I tried to use the merge() function of rasterio.merge but I end up with ...
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28
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Updating "no data" value of merged raster layer to be the same as the "unmerged" layer in QGIS?
I have many raster layers that I want to merge and a lot of these layers have gaps of no data. These gaps are specified as "no data" as pictured in image 1
I then go to the merge raster ...
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112
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Merging multiple layers together
I have got a series of mastermap layers, each displaying data relating to a 5km square of land. The layers contain data on things like roads, water, buildings etc. In total there are around 30 ...
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94
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Getting Holes in Orthomosaic using ArcMap
I'm having some problem combining DEM rasters (tif-files) into one layer. I'm using the function "Mosaic to New Raster" in data management and the result is a combined DEM raster with holes ...
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2
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129
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Merging two layers and assign ID of bigger polygons to smaller polygons within bigger
I am basically new to QGIS and want to use spatial data to get the state identifiers for small polygons (say counties/zip areas) which are geographically inside the bigger polygons (states/cities). ...
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2
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84
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Wrong cell values after merging rasters in QGIS
I have two raster files A and B which overlap in certain areas. These rasters should be merged into one while taking the exact values of raster A in the overlapping areas.
For this purpose, I intended ...
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2
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141
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Merging 2 non overlapping points datasets
I have 2 dataset of points, each one measures a different variable, i need to "merge"(not sure if it is the correct term) these two into one dataset.
My first instinct is to take a purple ...
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56
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How to correctly merge the value in the columns, in the case of using the widget type the Value map, with QGIS
Trying to do work that was previously done in ArcGIS. There is a table when filling 4 columns, these values are added in the Sum column.
In QGIS, I decided to use the Value Map for fields
For the ...
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132
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How to dissolve overlapping distance isochrones
For my master's thesis I need to create distance isochrones (10/20/30/../100km) around certain coordinates. In my case they overlap and I want the overlapping parts to dissolve, but at the same time ...
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927
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Dealing with multiple input layer in QGIS modeler
I would like to add atrribute with layer name using field calculator for many input layers and later merge updated layers into one.
I am able to use multiple input layer in modeler and later merge ...
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1
answer
520
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Merge nearby points from two shapefiles in QGIS
I am working with 2 shapefiles: points from one datasource and another. Some of the features are duplicates. However, since data quality in the second datasource is not as good as in the first one, ...
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43
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Reduce overlapping / close polylines to one line
I have a shapefile with multiple (often not perfectly overlapping lines). Attached is a picture of a typical situation found in the shapefile. I would like my output to have only one line (attributes ...
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118
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Merge connecting lines which have the same attributes?
In QGIS, there is a road map shape file, and I would like merge connecting lines which have the same attributums ("name" and "fclass").
I tried the "Dissolve" processing tool, but it doest't care ...
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304
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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 ...
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308
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Retain symbology when merging layers in QGIS
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 ...
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231
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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")
...
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answers
53
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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["...
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126
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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 ...
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550
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Error Code -2147483647 when combining vector layers
I am trying to combine multiple vector layers in QGIS using the "merge vector layers" function from the dropdown lists
(vector -> Data Management Tools -> Merge Vector Layers)
All data are ...
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215
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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 ...
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132
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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 ...
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220
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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 ...
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198
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Join or interpolate broken lines
I have these lines (blues lines) that extract from a raster and need to unite them automatically (red lines).
Currently I'm doing it manually using a plugin (Join multiple lines) but it's very tiring. ...
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243
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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 ...
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259
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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 ...
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462
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How do I remove the boundaries between municipalities of my shapefile?
I have a shapefile of a province right now. It includes the barangay/village boundaries and municipal boundaries. However, I only need the municipal boundaries. How will I remove the barangay/village ...
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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 ...
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