Questions tagged [merge]

To combine two or more parts into a larger whole.

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votes
2answers
612 views

Merging rasters in QGIS?

I have 3 modis tiles that I want to merge together. They were all reprojected in the same CRS (from sinusoidal to WGS84 UTM zone 32 N), but I cannot succeed. I have tried with merge and virtual raster,...
4
votes
2answers
537 views

Avoiding reprojection gaps when merging DEM rasters?

I have two raster DEMs in same resolution I want to bring together. I was using the merge-function in SAGA, GRASS and QGIS but I always get the following result: Where could the fault be?
4
votes
1answer
81 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 ...
4
votes
1answer
119 views

Visualize challenge: show origin of aggregated minimum r.series job

Using r.series with the aggregate minimum option I'm merging multiple viewshed results to visualize how much vertical space a development area has for new buildings. Meaning that a part of the height ...
4
votes
1answer
817 views

Merge selected feature pyqgis

I want to merge the selected features. I found this post but I can not do it. Can anybody help me? layer = iface.activeLayer() obj1 = 24 obj2= 25 expr = QgsExpression( " \"ID_PARCEL\" = '{}' OR \"...
4
votes
1answer
485 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 ...
4
votes
2answers
1k views

Merge rasters with different origins in R

I have a list of rasters with the same projection and resolution but different origins and I need to merge them in a single raster file. Here's my code l <- list.files('path', full.names=TRUE) ...
4
votes
2answers
368 views

GDAL_Merge Creates Washed Out Image

I'm attempting to use gdal_merge to stitch together four JP2 aerial orthophotos. the merge is successful, but the resulting image has washed out color, as you can see here: All color in the four ...
4
votes
1answer
1k views

Merge two rasters with different resolution

I'm a student and pretty much new with Qgis. I'm trying to merge two elevation rasters. They have different resolution (one is a 5mx5m DTM and the other is a 1mx1m DTM) and different extension. I'...
4
votes
1answer
317 views

Merge connected lines IF they share adjacent polygon(s) (arcgis/arcpy)

I have lots of lines that I need to merge IF and only if they share the same polygon(s). All lines are made from the polygons (copy-paste into line) so they all snap. In this little example line ...
4
votes
1answer
712 views

Calls to SAGA routines in QGIS not working cross platform

The ability to write and run cross platform scripts for QGIS using python is OUTSTANDING! However, when I try to run the SAGA:MERGESHAPESLAYERS algorithm from a python script it works fine in windows ...
4
votes
1answer
204 views

Merging Feature Classes and keeping the metadata

Is there a way that while merging two feature classes we can keep the metadata? We are merging feature classes with templates so we can import specific fields into our data. Is there a way to keep ...
4
votes
1answer
464 views

Merge polygon without attribute (in field) with nearest polygon with attribute

In the image you can see districts in BLUE with attributes (name of district) and small pieces in RED. The red polygons belong to the blue and I want to merge them. The RED are only towards the ...
4
votes
1answer
722 views

How to join data from NHGIS to make choropleth maps in R/ggplot2?

I have downloaded shapefiles of county/state boundaries and census data keyed to those shapefiles from the NHGIS. Both the shapefiles and the census data have a GISJOIN column to be used for merging ...
4
votes
1answer
1k views

Merging partially overlapping polygons into a table in PostGIS

I have a couple of tables (three) with polygons (landuse coverage in this case). Within each table, there is no overlap, but between tables there might be a lot of overlap. I would like to combine ...
4
votes
2answers
3k views

How to join lines in QGIS for later using “lines to poly”?

After successfully merging lines (using snapping) with merge_selected_features i got nice result - one merged line. Next thing was to make polygon from created merged line. Result is not nice - it ...
4
votes
0answers
72 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:...
4
votes
1answer
369 views

Merging raster elevation data

Using QGIS I have to merge 416 raster files with elevation data, at the beginning I´m using with only 4 of them to try out: When using "merge" (Raster > Miscellaneous) the result are a file with only ...
4
votes
1answer
151 views

What tool could I use to merge separate line vectors?

I started with a line vector file consisting of several creeks. The problem with that file was that most of the creeks within the file were broken illogically into segments, even those that should ...
4
votes
1answer
187 views

Batch Script to merge tab fles in a directory

Very similar to this question Merging multiple .tab files? can someone please help me with a batch script for this? Based on the answer in the above I have #!/bin/bash for i in *.tab; do ogr2ogr -...
4
votes
0answers
370 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
4answers
169 views

QGIS 3.4 merge raster output only 1 px wide

I have four .xyz files with terrain data. I can convert them to TIFs in QGIS 3.4, but in either format, merging them fails. The merge output always has the X dimension of the merged rasters, but a Y ...
3
votes
2answers
2k views

Merge thousands of rasters with gdal_merge.py

I have several thousands of small rasters, kb size, tens or hundreds of pixels most of them. Batch command of gdal_merge.py can't take all the files at once, so I am doing partial merges of chunks of ...
3
votes
3answers
442 views

Getting adjacent polygons to merge in QGIS?

I was given a shapefile made up of a few thousand squares. The data in the squares has 5 different values. I wanted to merge all the common values into the same polygon to simplify things. This is ...
3
votes
2answers
749 views

QGIS create a new merged layer from selection on multiple layers

I have a big map with several layers. I want to extract a small area in the map and merge the layers. I tried to merge the layers and than to select the zone I am interested, but the merging is ...
3
votes
3answers
440 views

How can I join two polygons that are within the same layer in QGIS?

I have two polygons in QGIS that are within the same layer and I want to merge them so they are not in two different polygons, which means that the gap between them sould not exist. How do I do that?
3
votes
3answers
400 views

Merge 30000 polygon shapefiiles in a logical manner in ArcGIS model Builder

I have 30000 shapefiles (a1.shp to a30000.shp). They are all polygons. Each polygons has one and only one polygon feature in it. I need to Merge the polygons into 1000 shapefiles. My output would be ...
3
votes
1answer
831 views

Merging Multiple JP2 image files on QGIS

I have about 150 Images that I need to merge together. I have tried to go about this by using the GDAL misc > merge tool but it is too much for QGIS to handle with even 20 images at a time. I was ...
3
votes
2answers
628 views

How to rename several layers at the same time?

I have got some GPS tracks (MultiLineString). As I import them to QGIS, they look like this: I would like to merge them and to do so, I have to rename all of them like this (picture 2) otherwise an ...
3
votes
1answer
3k views

Merge shapefiles in folders and subfolders with arcpy

I try to merge 20 shapefiles in order to get one shapefile that include all the features. All shapefiles are called "migrashim", and they spread in big folder that divided to a lot of sub folders. ...
3
votes
1answer
10k views

How to combine (join?) two overlapping polygons to determine combined area they cover?

How do I combine (join?) two overlapping polygons to determine the combined area they cover in ArcGIS 10? I am sure the Geoprocessing tools can do it, but just how eludes me.
3
votes
1answer
2k views

Merge a table with a shapefile (not the same dimension)

I am trying to merge a table with a shapefile using R. The shapefile's database is bigger than the table and I need to have null or zero values where the two data sets don't match. Table data no. ...
3
votes
2answers
123 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 > ...
3
votes
1answer
930 views

How to overlap and merge layers in QGIS?

I have two layers (1 and 2) and I want to overlap them and the intersection and the union didn't work. I want to get something like this: Is it really easy or is there a special method to follow ? ...
3
votes
2answers
537 views

QGIS merge multiple layers and keep highest valued polygon / grid cell

I'm still at a beginner level at QGIS. I'm aware of MMQGIS toolbox but I still can't figure out how to solve this problem.: I got multiple layers indicating the number of events in a grid cells ...
3
votes
2answers
608 views

How to Merge dbf files?

I'm beginner in python and learning it with examples. I have 100s of dbf tables like Type value1 value2 Type value1 value2 A 3 1 and A 5 7 B ...
3
votes
1answer
2k views

Overlaying lines and aggregating their values for overlapping segments using R?

I have a number of routes (5 in this example data) stored in a SpatialLinesDataFrame called r. These have different origins but all converge on the same destination (Manchester Airport): Each ...
3
votes
3answers
5k views

Converting set of Shapefiles to OpenStreetMap (OSM) file?

How can I convert a set of ShapeFiles to an OSM file?
3
votes
1answer
2k views

Merge feature classes in feature datasets using ArcPy?

I'm trying to merge a group of like feature classes which are contained within separate feature datasets. I can merge feature classes within a file geodatabase without having issues by creating a list ...
3
votes
6answers
17k views

Merging multiple .tab files?

I was wondering if there was a quick way to merge multiple .tab files together? I have about 100. Would appending one tab to another with the MapBasic window open, then changing the name of the ...
3
votes
2answers
3k views

Combine multiple TIFF Files into one

I have brought in multiple TIFF (raster) files into QGIS and want to combine them into one file. I tried this by going to Raster> Misc.> Merge. When doing this the output file comes out as gray and ...
3
votes
2answers
241 views

To compare and merge two point layers based on lat long

I have 2 shapefiles of point type. Both layers have lat/long associated with each point. In one shapefile, I have about 23 hundred thousand points and in another about 20k points. Because the first ...
3
votes
1answer
885 views

How to merge raster with FME with different spatial resulution?

I have two sets of raster (tiff, aerial photos) which I want to merge to one raster file with FME. The two sets have different spatial resolutions. Set A has a better resolution as B. The two set do ...
3
votes
1answer
871 views

How to merge layers into a single QgsVectorLayer?

I have a set of different layers (and their respective shapefiles) with information of electric lines. All the layers have the same Fields in their Attribute Tables, but contain information about ...
3
votes
1answer
4k views

What is FME equivalent to ArcGIS Dissolve?

I am trying to dissolve polygons that are spread out across a region. ArcMap's ModelBuilder will dissolve these polygons into a single, multi-part feature. How can I get FME to do this same thing? I ...
3
votes
1answer
504 views

Merging ShapeFiles with QGIS for UK counties

I want to draw a map for all the counties of the UK including Northern Ireland. Since I cannot find a source of counties including both Northern Ireland and Britain, I tried to merge two shapefiles ...
3
votes
2answers
434 views

How to merge same long lat points with different data into a unique one?

I have a layer where there is more than 1 feature for a same object. Imagine i have a layer called signals. There can be up to 10 features in the same place (long/lat) for a unique signal but the ...
3
votes
2answers
525 views

Pyqgis How to merge all the active layers? or layers in the registry?

I was wondering if there is a way to merge multiple layers. I actually would like to merge all layers in the registry programmatically, all of them are point layers and have the same fields. I have ...
3
votes
1answer
54 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 ...
3
votes
1answer
111 views

Merging all vector files within directory with QGIS?

I am unsuccessfully trying to merge all shapefiles in a given directory using QGIS 2.18. I do not want to navigate to the folder using QGIS GUI tools. Instead, I want my script to include all ...

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