Questions tagged [merge]

To combine two or more parts into a larger whole.

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37 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 ...
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1answer
49 views

Batch process for merging features in multiple layers

I have multiple (50) layers representing rivers and creeks which are polylines. However, they are broken into line segments so each river/creek layer might have 30 or so features within it. I know ...
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32 views

Creating a new layer for free space between existing layers

How can I create a new layer that will only show the 'free space' between the raster and vector layers that are currently on my map? Will I have to merge my existing raster and vector layers and use ...
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1answer
62 views

How to mosaic 3 different layers that do not overlap and make them into 1 layer

I have 3 different independent layers which I want to merge into one layer: For creating those layers, I have calculted NDVI, calculted the mean and then I have created one layer that is lower than ...
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1answer
36 views

Merging polygons in one layer by boundaries of polygons from another layer in QGIS

So I have two polygon layers, polygons in one layer are greater than in the other one. In some cases it is possible to merge smaller polygons so that they fit within the boundaries of a bigger polygon....
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1answer
87 views

Merging rasters orthophoto overlapped with different resolutions using QGIS

I use 2 rasters orthophotos .TIFF : 1) the low resolution covering a large area. 2) the high resolution covering a small area and using an alpha band around the point of interest. My aim is to merge ...
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1answer
27 views

Import GPX track into existing Line/MultiLineString Layer

I'm working on a project to map utility lines on a small university campus. We have paper maps right now, and we're looking to step into the modern era a little bit. What I currently have set up is ...
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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.
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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 ...
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2answers
32 views

Merging a .csv file with a .shp file in R

I am trying to merge a .csv file with a .shp file. The shapefile has more information that I need so I also want to limit it by only adding information for the counties in my csv file. I tried my code ...
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1answer
70 views

Merging line layer symbology where streets intersect using QGIS

I am working on a thematic map in QGIS 3.4 where I created a shp layer for lines to draw streets on top of a background map. The problem is individually drawn streets that intersect. Is there a way ...
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1answer
28 views

Better resolution of my raster

if I am merging my raster files or if I am creating a virtual raster, the quality is not as good, as the input rasters on their own. Before: As a virtual raster: Does somebody know any tips or ...
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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 ...
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45 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 ...
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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 '...
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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....
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32 views

Add missing features to attribute table

I have two tables with complementing data in them. Both have an ID column (tree_ID). Table A is missing several features which are in table B. How can i copy only features from B to A which are NOT ...
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1answer
44 views

Merging raster without add nodata value

I was trying to merge 2 DEM raster using QGIS raster - merge. Is there any way to not add nodata to the merged raster?
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1answer
54 views

From several polygons of one layer to one polygon

I have imported one CSV file where I have zones of the city. Is it possible to get one big polygon of the city?
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54 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:...
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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 ...
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59 views

QGIS Error with Merging rasters

I'm using QGIS 3.8 with grass . I have 3 rasters that are located far from each other and I would like to merge them into one raster layer. I managed to merge 2 of them but the third one makes ...
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2answers
54 views

Merging .tif files downloaded from Google Earth Engine in correct order in Python

When you download a large image from Google Earth Engine, it is in multiple small images. Each sub-image name contains the x_min and y_min coordinates of that image. It is described here - https://...
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2answers
116 views

Merging two Landsat TIFF file of same band in QGIS 3.4

I've been wanting to merge two TIFF files of same band (this case it will be B1 in Landsat). I have followed tutorials which I came across online, but none of them seems to work. Generally, raster > ...
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0answers
67 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 ...
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1answer
36 views

Applying field mapping during Merge using ArcPy

I am trying to merge 10 stream feature classes together using arcpy. But I need to limit the number of fields in the output (all feature classes share the same fields). working_dir = r"C:\Projects\...
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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', '...
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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 ...
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1answer
48 views

Merging or joining two tables with some matching columns in QGIS to calclulate unique values

I have two tables (A and B) that display the presence or absence of a species within a polygon and within each polygons associated buffer layer. The purpose of the buffer layer is to account for a ...
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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 ...
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63 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
48 views

Checking if selected features are adjacent using OpenLayers [closed]

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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2answers
45 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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23 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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0answers
26 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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21 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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47 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
51 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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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 ...
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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 ...
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1answer
14 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 ...
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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 ...
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12 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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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 ...
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1answer
173 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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1answer
50 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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1answer
77 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 ...
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0answers
36 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
21 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 ...
3
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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 ...