Questions tagged [merge]

To combine two or more parts into a larger whole.

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Merging DMAs using QGIS to create Custom Regions [on hold]

I am trying to create a new .shp file of custom regions. The regions are defined as a group of existing DMAs. I am using QGIS and the merge attributes function on the existing DMA .shp file. I ...
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14 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 ...
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2answers
22 views

Checking if selected features are adjacent using OpenLayers [on hold]

I need to be able to merge features on the condition that the selected features are adjacent to each other. How can I achieve this using Open Layers version 5?
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1answer
25 views

Merging multiple shapefiles into one nulls out values

I am working in QGIS 3.4, and trying to merge 10 polygon shapefiles into a single shapefile. However, the result is not preserving the values for most of the shapefiles, it's NULL-ing them out for ...
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12 views

Merge and CLASSIFY ImageCollections with different pixel size

I am trying to perform a classification on a merged imageCollection that includes median annual images for both the Landsat 8 and Sentinel-2 satellites. To merge the two datasets, I resampled all ...
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21 views

Merging polygons, only contiguous [duplicate]

I have a lot of polygons (20,000). Some of them are contiguous. Some not. (see picture) I want to merge the contiguous polygons into one. Does anyone know a function to solve this automatically with ...
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39 views

Fixing discontinuity after blending two rasters using GDAL

I've tried finding similar questions with no luck, so I apologize if this has been asked already. I have an observed temperature raster and a model analysis temperature raster. In places where there ...
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1answer
27 views

Selection by Location on Raster, Using a Vector Layer

I'm trying to identify raster cells by location to eventually convert them to vector polygons, and then add them to an existing vector layer. Below is a picture to illustrate the problem. The green ...
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13 views

NetCDF files in QGIS mean of 60 months, the program isn't recognizing subset files

I am trying to merge the files inside an NetCDF file in QGIS,all with same Longitude and latitude size and resolution, but this error is showing; Versión de QGIS: 3.8.3-Zanzibar Revisión del código ...
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1answer
406 views

Merge multiple raster .tif in QGIS 3.2?

I'm trying to merge 12 .tif raster layers (raster -> misc -> build virtual raster), but keep getting this error: Loading resulting layers The following layers were not correctly generated./var/...
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30 views

Updating shapefiles in QGIS

I've got a parcels layer from the state and i modified it by adding fields relating to my business as in project number and a reference plan field. The state updated their shapefile by adding new ...
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2answers
41 views

Merging multiple shapefiles using ArcPy

I have a list of paths of all the shapefiles (around 50) to be merged. All of them are at the same projection and none of them is sized more than 110MB (shp+dbf). The combined size of merge (shp+dbf) ...
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4answers
6k views

Mosaic to New Raster tool fail

I'm trying to merge 24 DEM files, after applying the tool (Mosaic to New Raster) only 11 out of the 24 merged. All the original files are in the same projection, pixel type, band, etc. I also ...
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1answer
414 views

Mosaicing thousands of raster files in ArcGIS?

I'm trying to mosaic a very large number of rasters (from 1000 to a maximum of 30000, each one having a very small size, less than 100 kb) into a unique final raster. I have tried to use the Mosaic ...
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0answers
17 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 ...
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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 ...
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1answer
111 views

batch merge error: Error in match.arg(method) : 'arg' must be of length 1

I am attempting to read in a series of polygon shapefiles from a directory and batch merge them into a single shapefile. They all have the exact same field names. I am using this code: all_data <-...
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1answer
1k views

Merge polygons in the same shapefile based on attributes, ArcGIS or ArcPy

I have a shapefile of polygons. I do not want any polygons with an area less than 25. For polygons with an area less than 25 I want to merge them with another polygon with an area greater than 25 that ...
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1answer
13 views

Adding dbfs in ModelBuilder?

I have built a model in ArcGIS ModelBuilder for which the output is several dbfs having five columns. I want to merge all the output dbfs into a 'master' dbf sheet in the model itself. How would I ...
3
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1answer
125 views

Resolving mistakes after merging polygons

My problem is quite similar to those of title "qgis merge polygons does not merge on snapped edges" and "Merging polygons". I'm merging several polygon features (within one layer), all adjacent with ...
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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 ...
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1answer
757 views

Using ST_Union to merge tables containing lines?

I have to build a street network with PostGIS that will be used with pgRouting. I have two tables: the_network (182 lines): is a MULTILINESTRING table. Having columns "road_name" (varchar), "...
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1answer
474 views

Using GDAL or Python, how can I merge/combine 3 NITF images (RGB) into one image and keep the RPC metadata intact?

I'm looking to merge 3 imagery bands that are saved as separate files. The file format is NITF. The reason they are saved as NITF is because they have RPC metadata embedded into the images. I would ...
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0answers
10 views

Difficulties merging 2 raster data sets in QGIS 3.8.2 [duplicate]

I'm trying to combine two raster data sets, one from USGS Earth explorer SRTM 30m, the other is UK Lidar data, the SRTM 30m data being a subset (smaller area) of the Lidar data, as I'm trying to fill ...
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1answer
57 views

How to dissolve overlapping polygons using GeoPandas

Assuming the following: from shapely.affinity import translate from shapely.geometry import Polygon import geopandas p0 = Polygon( [(0,0), (2,0), (2,2), (0,2)] ) p1 = translate(p0, xoff=1) p2 = ...
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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 ...
4
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1answer
68 views

Merging three rasters into one

I need to merge 3 rasters into one, each raster is single banded and ranges from 0 to 1. The rasters overlap at some places. Below is how each raster looks like and how the output should look like ...
3
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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 ...
11
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1answer
897 views

Merge adjacent polygons and return all (adjacent and not adjacent) as Multipolygon?

I have a postgres database with administrative boundaries and their geometry. Each of those boundaries have an ident number. What I want to achieve: First I want to select all rows which are ...
3
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1answer
43 views

Gaps in polygon after merging

When I use the merge tool on this polygon mesh, I end up with a multipart polygon with large gaps. Before this, I was getting an error when trying to run a merge or dissolve because of "Polygons with ...
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0answers
34 views

Unexpected error merging three point shapefiles

I get the following error when I try to merge the files: The error says that there is an unexpected error. I have deleted the lock files and an empty ArcMap document. It still gives me this error.
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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 ...
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1answer
30 views

Merge ImageCollections with different pixel size

I want to combine 2 different Image Collections (i.e. Landsat8 and Sentinel-2), and I want to combine them to a unique ImageCollection (and then run the function qualityMosaic()). However, they have ...
1
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0answers
40 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 ...
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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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1answer
489 views

How to set the “LAYERS” parameter of the QGIS 3 algorithm “native:mergevectorlayers”

I do not understand how to set the LAYERS parameter for the QGIS 3 native: mergevectorlayers algorithm (for standalone python code). Merge vector layers (native:mergevectorlayers) ... ----------------...
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2answers
2k views

problem combining geometries from all features in a layer as one geometry

I am trying to combine all features of a Polygon layer in QGIS in a python plugin, and am running into this error when I try to run the combine method: "AttributeError: 'NoneType' object has no ...
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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 ...
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1answer
41 views

Merging polygons without losing area using ArcGIS Pro?

I have a shapefile with 23 polygons,I want to merge them and get the total area of this big polygon. But when I used "merge"tool, it only merge polygons but area. Any ideas about what I should do?
4
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1answer
5k views

Merging hundreds of vector layers and sum attributes in QGIS?

I am still at a fairly beginner level with QGIS. I am trying to construct a map of mean daily rainfall in Africa over the past ten years. I have access to shapefiles for daily rainfall (with ...
1
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1answer
78 views

How to append OS MasterMap Feature Class to the Feature class in PostgreSQL database

I have my Enterprise Geodatabase as PostgreSQL. I want to keep OS MasterMap data on the Geodatabase and would like to update it whenever a new tile is downloaded. However, I am struggling to find a ...
1
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1answer
276 views

Merging multiple non overlapping raster layers into one layer

I'm working in Qgis 2.14 and have received multiple raster files for the Height of a terrain that combined covers the entire terrain I’m interested in. I would like to combine them. Because the ...
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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 ...
3
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1answer
95 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
votes
2answers
68 views

Joining the attributes of two nearly congruent streetnetworks (lines) in QGIS

I have two streetnetwork layers containing both different attributes, none of them is similar so I can´t do a simple join. Unfortunately they are not congruent, but the line objects are close to each ...
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0answers
21 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'...
2
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1answer
36 views

Using data from 30-meter DEM map to fill into missing pixels in 8-meter DEM map

I have a DEM map of 8-meter resolution, where some groups of pixels are blank due to the clouds (I guess). Is there a way in ArcGIS or GRASS to fill into those null areas with data from 30-meter DEM ...
2
votes
1answer
56 views

Using shape to find and merge photos in FME?

We have a directory with over 300 aerial photos of our town. Every photo has an unique name. Using an georeferenced Esri shapefile of a specific area we want to copy the photos that are coverd by the ...
1
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4answers
1k views

MMQGIS: delimiter error on CSV import for merging

I have a shape of my city and I have a CSV file, containing attributes I'd like to join into the shape of the city. In selection of the CSV file, I get the following error message by MMQGIS. Source ...
1
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1answer
33 views

Regroup multiple polygon with same attributes in one

After looking for an answer on some forums (without success :/) i post here in hope on of you can help me. I have a polygon shapefile with thousands of entities (=row) and >10 attribute column. A ...