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Questions tagged [merge]

To combine two or more parts into a larger whole.

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Stitching geotypes into a mosaic [closed]

How can I stitch satellite images using python, making the image connection borders invisible? I am surprised, but there is still no ready-made solution for gluing a mosaic of typhus with adequate ...
Кирилл Ярков's user avatar
1 vote
1 answer
36 views

Union of 2+ point datasets with overlapping and non-overlapping lat/lon points

I have three point layers with n1, n2, and n3 number of points. Each dataset shares with the others a common set of points that refer to the same spatial entities. The lat/lon values of these shared ...
Oliver Amundsen's user avatar
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Saving a merged layer changes attribute table columns to Asian characters

When I merge layers the temporary attribute table looks fine, with the expected column headings. However after I save the temporary layer, either by making permanent or by exporting features the ...
AnneA's user avatar
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1 vote
1 answer
434 views

130 TIF DEM file (total size 3 GB) become 7.4 GB TIF file after merging. Why?

I combined (Merge) 130 DEM maps via QGIS, taking up 3 GB in total. However, the total size of the combined file was 7.4 GB. I'm new to QGIS. It's only been a few weeks. I don't understand why the file ...
William24's user avatar
1 vote
0 answers
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tile-join is not displaying older tiles at higher zoom levels

I use tippecanoe to convert geojson file to pbf tiles using this command tippecanoe -e output_dir -zg -Z10 --drop-densest-as-needed --no-tile-compression --extend-zooms-if-still-dropping -l features ...
user2260554's user avatar
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1 answer
57 views

Merging DEM with different resolutions

I am going to merge two DEM raster files with different resolutions (5m and 12.5m). I would like to merge them in a way that they should keep their own resolution. How can I do this in ArcGIS Pro?
Mohammad Elyas Hamidi's user avatar
1 vote
1 answer
53 views

Looping through folders to find shapefiles and then merge them

I am trying to merge shapefiles into one shapefile by looping through folders. I merge them one by one by iterating through each file then merging it with an empty gdf that I set with columns that are ...
Ekkehardt Rosasee's user avatar
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Troubles merging many rasters into worldwide map

I am trying to combine 267 flood hazard maps into one single global layer in QGIS. While trying this with the raster>miscellaneous>Merge function I needed 250gb of space even though the combined ...
Sebastian's user avatar
1 vote
0 answers
27 views

Problem with merging rasters in QGIS

I merged rasters in QGIS, and the resulting image appears like this. The minimum value is -3.40282e+38, which seems incorrect. How can I solve this issue?
Awk G's user avatar
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1 vote
1 answer
51 views

Why do st_union and dplyr::summarise produce different results, with summarise giving me the object I want?

I have a file with 2013 geographical boundaries for NZ. The file looks like: and the file overview is I used to work with the rgdal and rgeos packages, and am now updating the code so that it works ...
Michelle's user avatar
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1 vote
1 answer
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Merge two rasters with the rastercalculator

I like to merge two rasterlayers with the rastercalculator. The Layer_1 rasterlayer have a rectangularshape with a NoData Area in the center (white area). The uniform value is 10 (green area) and the ...
Kai's user avatar
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1 answer
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QGIS: Set two raster to the same height

I have 2 DEM raster in QGIS. I want to merge them, but they have a difference in height of approx. 9m. This means that when I merge them, there is a kind of break-off edge at the transition. Can I ...
Fabi's user avatar
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1 vote
0 answers
17 views

Adding cells to raster layer after merging raster layers in QGIS

The issue I have a raster layer that represents a river catchment. I want to use it in software that requires the exit of the catchment to be at the edge of the extent. To do this I need to add some ...
Melanie Baker's user avatar
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26 views

Merging arrays creates gaps betwen, the rasters

I merge many hundred rasters all in the same projection, same orientation, same resolution. The next raster should start where there last ended (no overly, zero gap). I merge DataArrays with rioxarray'...
tetje's user avatar
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Merging grid vectors that are touching one another in QGIS

As in the picture below, I am trying to merge the grids that are touching one another into a single polygon. I tried using the dissolve configuration on QGIS but it produced either 1) a vector polygon ...
Izzy's user avatar
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Merging non-overlapping classified rasters with varying nb of classes

In ArcGIS Pro 3.2, I have several tiles of 1km² as composite rasters (4 bands+NDVI+NDVIre+DSM). I classify each tile independantly with SVM and segmentation, using a training scheme with 8 classes. ...
JeremieT's user avatar
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1 answer
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Fill gaps in one high resolution raster with data from another low resolution raster using QGIS

I have a high res (5m) image with data gaps due to cloud cover. I want to fill these gaps somehow, and have a lower res (30m) raster which has data in these gap areas. I've tried merging in QGIS, but ...
SHV_la's user avatar
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0 votes
1 answer
31 views

QGIS - transfer outcrop pixels from a DEM raster onto another raster surface at a lower level

In QGIS I would like a solution that will transfer pixels from a DEM raster onto another raster surface at a lower level. I am trying to create 2 geological surfaces, one being ground level (GL) and ...
Fitch's user avatar
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0 answers
37 views

Merging overlapping rasters using ArcGIS Pro

I am trying to merge multiple rasters into one raster. I have tried multiple methods, including: Importing them into a file geodatabase raster, merge tool, made a mosaic dataset, but none of these ...
Bryan's user avatar
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1 answer
53 views

How to merge Landsat data on different paths in R

I am trying to merge four landsat (derived product) images available at https://e4ftl01.cr.usgs.gov/MEASURES/GFCC30TC.003/2000.01.01/. You will have to have a NASA Earthdata login username to access ...
Cannon's user avatar
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1 vote
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31 views

Merge Arrays (Mosaic) larger than RAM

I have a bunch of GeoTIFF files. These are about 100 GB on drive, when using compression with zstd (speed level). Hence, when loading, they are still much larger. I can load them in rioxarray with ...
tetje's user avatar
  • 99
1 vote
0 answers
56 views

Overlay TIFF with raster layer

I am using QGIS 3.23.3-Lima. Input files TIFF: 12 TIFF files with species abundance data (output of a species distribution model) Input file shape: Esri shapefile with the 12 biogeorgions. Aim: One ...
Sibylle Stöckli's user avatar
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1 answer
73 views

How to replace bathymetry in a DEM

I have a merit DEM TIFF file and in that file, I simply wish to replace some values by taking values from another TIFF file that has bathymetry data for a lake. Can I do this using a raster calculator?...
Cynthia Fowler's user avatar
1 vote
0 answers
31 views

Stacking two TIFF images with rasterio or GDAL - each TIFF has different projections and sizes

I have two images with different projections, sizes, resolutions and area covered. Let's call these two images 'MPF' - which covers a huge part of the Arctic reiong, and 'S1' (sentinel-1) which covers ...
SNunes's user avatar
  • 11
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0 answers
25 views

How do I merge shapes in different layers to one big area?

How do I merge shapes in different layers to one big area, I already tried "Vector > Data Management Tools > Merge Vector Layers" but that only puts the attributes of the layers in one ...
hptlucas's user avatar
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0 answers
47 views

Merge Raster Data Not Working

I am trying to merge about 70+ raster images into 1 large raster tiff. I try running the tool located in raster>miscellaneous>merge and before running the tool, selecting all the images I'd like ...
CaptainFishboy's user avatar
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0 answers
31 views

Merge road layer.shp and underground bt layer.geojson

I would like to merge a road layer .shp and a BT souterrain.gejoson network layer to create a single layer. This will allow me to form a unified network to calculate the shortest path between two ...
rzk's user avatar
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1 vote
0 answers
63 views

Removing the split between merged polygon in QGIS

I merged two polygons within one shapefile and then aligned all the vertices so that they were adjacent, but how do I remove the former edges that bisect the polygon so that the geometry is continuous?...
MapDeath's user avatar
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1 vote
1 answer
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QGIS DEM (Raster) merge: errors

I'm trying to merge 4 tiles (ASC) of a French 1m digital elevation model. Files are loaded in QGIS, they bear no errors, value range is coherent. Merging comes with errors and the result is a raster ...
Gilles's user avatar
  • 405
3 votes
1 answer
82 views

How to speed up ST_Union PostGIS query for complex problem

I'm fairly new to working with PostGIS and have experienced the issue of extremely long runtimes when working on my data. Here's what I'm trying to do: I have an infrastructure dataset that is made up ...
Felix_geospatial's user avatar
3 votes
1 answer
255 views

How do I merge/dissolve two polygons within one shapefile in QGIS?

I have a shapefile composed of many polygons. I want to merge/combine/dissolve some adjacent polygons that I have selected within the shapefile into one polygon without any slivers or lines left in ...
MapDeath's user avatar
  • 341
1 vote
2 answers
167 views

How to union two polygon shapefiles by one or more attribute fields in QGIS

I would like to union two polygons that have the exact same fields in their attribute tables in QGIS. However when I use the Union tool, it makes an attribute table that has exactly twice the amount ...
MapDeath's user avatar
  • 341
-2 votes
4 answers
267 views

Merging features with same value in table (CSV) [closed]

I have a table (CSV) with statistical data for different neighbourhoods in a city (population according to different age categories). My problem is that the neighbourhood doesn't have one field per ...
Klara H's user avatar
0 votes
1 answer
74 views

Using Merge in ModelBuilder of ArcGIS Pro

I am relatively new to ModelBuilder. I am trying a basic task using the merge function. I have a folder which consists of a lot of shapefiles. Each shapefile from the folder needs to merge with file '...
Sara's user avatar
  • 1
0 votes
0 answers
157 views

How do I merge 8 data frame without having duplicate suffixes?

I'm trying to merge a grid cell data set with 7 travel time (to shopping centres) data sets. Here's the head of the grid cell data: Here's the head of one of the shopping centre data sets(The other ...
mfirdaus_96's user avatar
5 votes
1 answer
208 views

Display only one label for overlapping points in QGIS

I have a point layer with some overlapping points but I want to display only one label per symbol. For line and polygon symbology there is the "Merged features" option to agglomerate ...
dmjf08's user avatar
  • 1,293
0 votes
0 answers
133 views

Correctly merge Landsat images in a median mosaic using different tiles

I have several Landsat 8 and 9 images, from two different tiles that I want to merge together in a median mosaic. The tiles are tiles that overlap, with two images for each tile. What I'm doing to ...
rrwork___'s user avatar
1 vote
2 answers
151 views

Merging layers, then dissolving and keeping all attribute values in QGIS

I have three layers in QGIS, each with one feature, including some attributes. Layer 1 has attributes a, b, and c, Layer 2 has attributes d, e, and f and Layer 3 has attributes g, h, and i I want to ...
winnewoerp's user avatar
  • 1,504
1 vote
0 answers
90 views

Is there any way to merge multiple .cog files into one using python?

I need to merge several .cog files into one. I have tried using rasterio, rioxarray, gdal, etc but I have not been able to get it to work. The closest I have been able to get was through this function ...
Guzmán R's user avatar
0 votes
1 answer
80 views

Merging multiple line and point vectors in QGIS 3.28 [closed]

I have hundreds of line and vector layers. The line and vector layers are from several kml files. I want to combine the line and point vectors respectively and automatically without having to manually ...
SimplyWilly's user avatar
2 votes
1 answer
77 views

Should I merge SRTM tiles then reproject or reproject each tile then merge?

I have downloaded SRTM elevation tiles for England and Wales from USGS EarthExplorer. There are around 40 raster files to cover England and Wales. I now need to use QGIS to create slope and aspect ...
BlackDouglas's user avatar
2 votes
0 answers
37 views

Merging smaller polygons into bigger surrounding polygons in QGIS [closed]

I am using QGIS 3.34.2 (Prizren). I am using a village-level shapefile which I downloaded from SHRUG. I have to use only the villages in West Bengal for an analysis. Furthermore, I need to combine the ...
Ramandeep's user avatar
1 vote
1 answer
48 views

Merge multiple histograms into a single table and export as CSV

I'm trying to merge multiple histograms of NDVI into a single table for future analysis I know how to export and download single histogram like in the second image, but I'm aiming for something that ...
Harel's user avatar
  • 91
3 votes
1 answer
107 views

Merging all layers found within File Geodatabase using QGIS

At 3.34.1, I need to merge all layers within a single File Geodatabase. All layers are polygonal and are in the same CRS. Specifically, I would like to conduct the merge without having to first load ...
Stu Smith's user avatar
  • 8,192
1 vote
1 answer
91 views

Connect touching lines by condition using expressions in QGIS

I have a polyline layer (Layer_A) in QGIS that represents entities (street crossings) that either consist of a single feature or are split into two or more features. The entities may also touch at ...
winnewoerp's user avatar
  • 1,504
0 votes
1 answer
119 views

ArcGIS Pro 3.1.2 change only blank selected cells in attribute table

I am using ArcGIS Pro 3.1.2. Is it possible to change only the null values cell in a selected dataset? I could have export the selected features as a new shapefile. Select the null values and replace ...
GIS Noh's user avatar
  • 321
1 vote
1 answer
65 views

How to merge sample points that are within a certain distance of each other and calculate mean attributes values for merged points in QGIS?

I have a data set like the following in .csv: sample latitude longitude variable1 variable2 variable3 A 37.18 -115.85 1 0 0 B 37.18 -115.85 1 0 0 C 37.18 -115.85 1 0 0 D 39.44 -117.66 0 1 0 E 39....
goshawk's user avatar
  • 53
1 vote
0 answers
36 views

Using data points lying within certain isochrone to model walking routes in QGIS

I am trying to model the routes students take to university on foot using QGIS. I have the student data in point form, but this is the student data for the whole city. I also have an isochrone which ...
jd6915's user avatar
  • 11
1 vote
1 answer
63 views

Rasterizing raster layers with style

I am merging some old maps with the georeferencer tool. but there are gaps on the edges of the old maps. These gaps can overlap the other map when merging the maps. As a solution I made the white ...
firstlord's user avatar
  • 149
0 votes
0 answers
82 views

Merge two GeoJSON files into one creating connection between parcel info and object info

I have two GeoJSON files, one with parcel info (multiplygons) and one with object on the parcel info (multipolygons). The files have exactly the same attributes. What would be the best way to join ...
zizu 112233's user avatar

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