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Geographic Information Systems

Questions tagged [merge]

To combine two or more parts into a larger whole.

763 questions
info Newest Frequent Votes Active Unanswered
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1answer
40 views

Maintaining Borders when Merging shapefiles?

I am trying to merge two layers of a map which includes the state and county levels. I was able to edit the borders to look how I want, but when I merge them I am struggling to keep the style ...
0
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0answers
22 views

Merging polygons in ArcMap?

Inside the red circle, there are two yellow polygons of different sizes inside the large polygons. There are many such polygons. I want to merge the attribute information of a large yellow polygon in ...
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0answers
18 views

Calculating canopy model (CHM) using QGIS Raster Calculator?

Is it possible to calculate canopy model (CHM) with raster calculator from such input data? (DSM1 + DSM2 + DSMn) - DTM Or, is it necessary to merge DSMs first?
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1answer
26 views

QGIS - Missing GDAL Tools plug-in (merging Raster TIFFs of satellite image)

I am trying to install the GDAL Tools plug-in but it is missing from the Plug-ins list. I am looking to merge multiple Raster TIFFs which make up my satellite image basemap, exported using Atlas, ...
1
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0answers
27 views

Tabulating points from CSV that are within 1 km of points from another CSV using QGIS?

I have two sets of data. One that is from a csv and contains a relatively small amount of data (we will call location data), and another csv that contains a larger dataset that contains environmental ...
1
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2answers
72 views

Combining data from overlapping polygons and assign [duplicate]

I have two multipolygons layers: Layer A: Census blocks with data from 2010 (last census). Layer B: A study about poor neighborhoods with data from 2016 (POOR NH). Both layers have a "population" ...
0
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1answer
32 views

Combining multiple shapefiles into one shapefile using ArcMap?

I have two .shp containing stream segments from two different NHD HUC files (see photo). I would like to make these into one shapefile and combine the attribute tables. I have tried to use the merge ...
0
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1answer
46 views

Merge small underlying polygons into overlaying shapefile with larger polygons [closed]

I have a dataset with the average rent prices saved in a vector layer (.shp). It is "street" based, so it has quite a fine resolution. I have a different dataset (containing info about crime rates) in ...
2
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2answers
46 views

Are there different definitions of “merge”?

The merge tool in ArcGIS ArcToolbox is used to combine two layers, but it seems that there is also a Merge option under Modify Features that is used to combine and dissolve adjacent features within a ...
0
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0answers
36 views

How to merge / join line segments by attribute and split at intersection

I have a complex network of line features with a lot of attributes (and unique IDs). Many features have the exact same values (exept the ID). I need to join all features with the same attribute which ...
0
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0answers
31 views

Merge shapefile data within the same spatialpolygonsdataframe in R, when not all data have the merge column populated?

I have a 156Mb shapefile of New Zealand polygons down to the individual suburb level. There are 7,369 polygons. Each polygon has a unique ID (1...7369) in an ID column. There is a Suburb column ...
3
votes
1answer
56 views

How do I split subjacent lines and merge attributes in QGIS [duplicate]

I have 2 vector line layers. They are subjacent, so one of them is exactly on top of the other but the features have different nodes and attributes. My goal is to create labels and descriptions for ...
2
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0answers
45 views

Merging sections of lines with same geometry in QGIS? [duplicate]

I have a series of bus routes with the frequency/hour attached in QGIS. The idea is to combine the frequencies on routes with more than one bus to have an overall bus frequency for the sections of ...
3
votes
1answer
41 views

Copy elevation from points to line

I have a vector line, but it has no z-dimension. I have some points along the line, which have the elevation included. Can I add the elevation from the points to the line at that specific point? ...
1
vote
1answer
68 views

Merge connected lines and split them after set unequal distances

I need to edit line features in QGIS 3.4.4. I have more than 1000 line features that I want to first merge and then split. The line features describe roads in useless intervals, my goal is to ...
0
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0answers
23 views

How to fix discontinuity after blending two rasters

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 ...
0
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0answers
29 views

OSM.PBF does not contain all exported/merged/converted data from XML using OSMIUM/OSMOSIS

I have three pbf files, each containing poi nodes x ways y multi-polygon relations z separately. I tried merging them using: osmosis --read-pbf file=x.pbf --read-pbf file=y.pbf --read-pbf z.pbf --...
0
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0answers
55 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 ...
0
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2answers
34 views

Merging layers with different objectid types

I have a problem that's stumped me. I'm merging flood hazard layers from FEMA. For most states, the objectid is a real number. California (we're always the weird ones) has an objectid that's '...
1
vote
1answer
36 views

Merging feature classes in memory gives ERROR 001156?

arcpy.AddField_management("in_memory/originalfc","ALPHABET","TEXT",1) arcpy.Select_analysis("in_memory/originalfc","in_memory/A","attr<=0") arcpy.CalculateField_management("in_memory/A","ALPHABET",'...
1
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0answers
63 views

Python: No module named 'gdal_merge'

I try to merge two DEM data sets with python, using gdal_merge, but it doesn't work. I install like this: from osgeo import gdal But this doesn't work: import gdal_merge as gm I get the error ...
1
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1answer
56 views

Merging TIFF files using QGIS?

I have around 1200 tiff files (example below), and corresponding .tfw files and .aux files with sonar data that I'd need to merge into one file and I'm struggling to do so. I browsed some topics ...
1
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1answer
50 views

Why can't I buffer polygons in ArcGIS Pro?

I've created a polygon by merging several polygons from the same layer using the merge option under Edit menu. Now I cannot buffer the resulting polygon. I tried repair geometry it didn't help. I'm ...
0
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0answers
34 views

Merge gives an empty output

Within ModelBuilder I've got an orginal file, out of this file a few locations are extracted by mask and the data has been changed afterward. Now I am trying to put this data back by first erasing the ...
5
votes
1answer
146 views

Is there a “Merge Parts” tool in QGIS?

In the advanced digitizing toolbar, QGIS has these 3 tools: Split Features, Split Parts, and Merge Features. Is there a tool or equivalent algorithm for the logical fourth one: "Merge Parts"? This ...
3
votes
1answer
146 views

Merging lines (with and with no overlaps) in QGIS

I have two layers ("Layer_1" and "Layer_2") of lines where they sometimes overlap and follow each other for a bit and then takes another route (see the image below). "Layer_1": Red line "Layer_2": ...
0
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0answers
55 views

Merge two shapefiles into one new shapefile with OGR/GDAL library in C#?

I am currently coding a C#/WPF application that lets you choose two shapefiles and create a new merged one, with the content of both shapefiles. My problem is that I am quite new (1 month with gis) ...
2
votes
3answers
82 views

Merging layers into one- QGIS

I have numerous population layers for the Baltic Sea. In the attribute table of each layer, I have population densities, name of towns etc, all the same geometry (points). I'd like to merge the layers ...
8
votes
1answer
452 views

Merging overlapping buildings but not adjacent buildings using ArcMap?

I have a dataset that has buildings generated from satellites which leads to imperfect building outlines. The buildings circled in red are one building but the computer drew them as having multiple ...
0
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1answer
22 views

Merging layers with preferences or ranks using ArcGIS Desktop?

I want to make a "Mosaic" or a "Compilation" of 20 shp. layers which some of them are overlap. The layers has a field named "Year" and I want the newest be on top and delete the overlap older shps ...
2
votes
1answer
68 views

Getting maximum values of attribute of multiple Shapefiles merged into new shapefile in QGIS?

I have thousands of points in multiple shapefiles. I want to get the maximum value of an attribute of each shapefile. Then I want to merge all the maximum values to a new layer. Is there a way to ...
4
votes
2answers
323 views

Getting black square after merging two rasters in QGIS

After merging two SRTM TIFF files all I get is a black rectangle. Merged raster has zeros next to both black and white squares under layer name. I have no clue what I am doing wrong. Any suggestions?...
0
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2answers
67 views

GRASS r.viewshed from Python with multiple raster tiles

I'm new to GRASS and struggling to do a viewshed across multiple tiles. I have got the GRASS r.viewshed function working from Python as follows for a single tile: gis_path = os.path.join(output_dir, '...
2
votes
1answer
25 views

Merging multiple rasters applying priority rules using ArcGIS Desktop?

I have three raster layers covering the same geographic area. I would like to merge them into a single raster layer. The layers have different levels of importance, so I would like the merge to move ...
1
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0answers
24 views

Project tool swallows data [closed]

I want to project my data into another coordinate system. I tried using the Project tool but when I opened the attribute table after ArcGIS said it had finished it was empty. I also tried using ...
1
vote
2answers
199 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 ...
0
votes
1answer
156 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 ...
1
vote
1answer
26 views

Appending annotations changes the scale of the new annotation?

I am trying to append an annotation feature 1 (green)to another annotation feature 2(red). While these features are separate, I have the scale set to 1:4000, and the font size is correct. However, ...
1
vote
1answer
43 views

Merging on specific fields

Lets say I have three shapefiles/features I want to merge: 'florida.shp', 'mississipi.shp' and 'louisiana.shp'. They all have 3 standard fields common to all: 'DFIRMID', 'SFX', and 'FIRMPAN'. I want ...
0
votes
1answer
48 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 <-...
0
votes
0answers
46 views

Python - Merge shapefile polygons based on criteria

I have a shapefile with thousands of polygons and would like to merge (join) adjacent polygons based on a threshold between attributes. I need to use python because I'm not allowed to use ArcGIS. e.g....
0
votes
0answers
70 views

Combine GeoJSON files into bigger shapes with external JSON to merge on

I have a shapefile of New York ZCTAs here I also have these neighborhood definitions that map zip codes to New York City Boroughs. I'd like to take my "all of New York zip code" data and: Clump up ...
0
votes
0answers
34 views

Convert shapefile to KML: KML polygons don't match shapefile

I've edited my shapefile quite a bit using the Cut and Merge tool (through the Editor toolbox, not the geoprocessing tool). It looks like this: For some reason, when I export the shapefile to a KML ...
1
vote
2answers
36 views

Merge Featureclasses if there is more than one in the FeatureClassSet

i want to check through all my gdb if a FeatureClassSet contains more than one FeatureClass. If so merge them and save the result in an other gdb otherwise just copy them to the gdb. It sounds really ...
0
votes
2answers
27 views

Merged vector layers in two seperate rows in attribute table QGIS

I merged two shapefiles together, with the same geometry: rain runoff data in a watershed population living in that watershed But when I open the attribute table, the information merged is presented ...
2
votes
1answer
38 views

Polygons split themselves when I zoom out

I've been having issues with polygons getting deleted and re-created in this layer, and also with polygons not merging the way I would expect. I thought I had everything fixed-- my topology check ...
3
votes
3answers
69 views

Dissolving polygons when only relationship is spatial location?

I have a feature class with parcel information; some of the parcels have roads included while others do not. When a parcel has a road included there is always a matching parcel without the road ...
1
vote
1answer
78 views

Removing black lines between merged tiles?

I merged several rasters, but there is a problem with lines between sheets. Raster is created from LiDAR datasets. Rasters were produced from different datasets via this application: https://iaps.zrc-...
0
votes
1answer
132 views

Combining multiple .tiff files obtained after download from Google Earth Engine?

I downloaded some of my classified images from GEE using the following script- Export.image.toDrive({ image: input.clip(district), description: 'Test', maxPixels: 499295920080, scale: 30 })...
-1
votes
1answer
40 views

Sum fields in ArcGIS

I need to merge fields in rows in the attribute table based on common values of some attributes and calculate the sum of the area associated to them. How can I do that?

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