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Questions tagged [merge]

To combine two or more parts into a larger whole.

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votes
1answer
417 views

Image classification for a study site falling over two adjacent Landsat 8 scenes using QGIS or ArcGIS Desktop

I will be using GRASS on OSX to classify Landsat 8 geotiff images to create a vegetation map for a study site that happens to fall over 2 separate Landsat scenes. I seek advice about which route to ...
3
votes
2answers
476 views

Merge two geodatabases with identical structure

I'm using an ArcGIS addon which stores all created data (shapes and tables) in a gdb. The addon is made for single user use but to safe time I want to split the work with someone else. After that I ...
3
votes
1answer
117 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
0answers
79 views

QGIS - Parallel Lines - Count length of one

I have a large layer of lines (telecommunication duct) with in parts several parallel lines that are close to each other (cause they lay in the same trench). I would like to count the length of the ...
3
votes
0answers
414 views

Merging asc files in QGIS?

I am trying to merge 8 .asc files using merge option in QGIS 2.4 but when I do that it makes like contour of the file when I want to merge the files together. .ASC Files: Result after merging:
3
votes
0answers
121 views

Tool for merging OSM and Google route data

I'm using google API in order to solve a routing problem; by giving it points of source and destination and demanding the route. Now I want to project the route on an OSM map. Is there any tools to ...
3
votes
0answers
63 views

How can I merge roads layers that do not align perfectly?

I have multiple roads layers for a given area and would like to merge them into one layer since they each have some unique roads the other layer does not show. However, the roads that these layers ...
3
votes
0answers
1k views

Merge succeeds but output missing? [closed]

I have problems with Merge tool. I can't find the output file in ArcCatalog even though I refresh it. Output is shown in Results window but nothign happens if I click Add to display. Strangely, also ...
3
votes
0answers
288 views

Keys for merging US state/county ANSI's with GADM Unique identifiers?

I've got county-level data from USDA NASS, and I want to merge it with gridded climate data. A preliminary step is the associate the counties with the coordinates of their centroids. If I merge by ...
3
votes
0answers
195 views

QGIS 2.12 LAStools lasmerge error: “no outputs specified” [closed]

I am trying to merge 4 .las files with "lasmerge" within "LAStools" in QGIS 2.12 running Windows 7 64. I keep on geting error "no outputs specified" even thoug i did specify the output folder and ...
3
votes
0answers
244 views

Create polygons from many small. Expand to include space between

I'm just a programmer without GIS-skills as such. Hence this question: Intro: I have a lot of polygons; actually each private-owned real estate in my country. I also have "counties" as polygons. In ...
3
votes
0answers
666 views

How can you calculate the union/merge two polygons with ogr2ogr?

I want to calculate the union/merge two overlapping polygons using ogr2ogr (as I have 300+ to do). I want the output to be the same as you would get if you used the 'Merge shapefiles to one' command ...
3
votes
1answer
50 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 ...
2
votes
3answers
461 views

Optimizing arcpy.da.Walk performance?

I'm trying to automate a workflow that currently costs a co-worker about 45 minutes. General run down is this person copies files from a network drive onto a local one, and process it through four ...
2
votes
2answers
497 views

Render polygons ordered by size

How can I merge shapefiles in a special order in QGIS? What I have and what I need to be merged in that order: What happens when using merge by mmqgis: As u can see not usable at all. Attributes are ...
2
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 ...
2
votes
3answers
4k views

Can ArcGIS only merge two shapefiles each time?

I need to merge multiple point shapefiles (in the same directory) into one point shapefile. After inputting these shapefiles and merging it, I found the final output only contained the data from two ...
2
votes
2answers
840 views

merging raster aerials in QGIS issue

I follow the instructions here very closely and yet every time QGIS gets caught in a loop. It takes a few small rasters totally less than 100mb and creates HUGE gb files and will not stop until python....
2
votes
1answer
1k views

Which value does raster merge chose in overlapping area?

When using the 'Merge' tool in QGIS, which raster value does it choose when there are overlaps between the raster?
2
votes
3answers
167 views

Can QGIS merge CSV files with different colums? [closed]

I am trying to merge a month's worth of daily CSV files without using ArcGIS. Each file has ~25,000 entries so this is a high data load project. Sample data can be found here. Note that we are using ...
2
votes
2answers
4k views

How can I create a merged buffer in QGIS then count points that fall within it

I have a QGIS plan which shows ponds (as points in a shape file with an OS tile as a background) within a survey area. I need to calculate the total number of ponds within 1 km of each of the on-site ...
2
votes
2answers
549 views

Merging polygon slivers to largest adjacent polygon using ArcGIS Desktop?

I've got several hundred thousand slivers in my dataset as a result of cutting in a layer. Does anyone have a good solution as to how to have ArcGIS Desktop evaluate the position of each sliver and ...
2
votes
2answers
877 views

Using Python to execute merge of rasters

I need help with a python script to iterate merge (gdal_merge.py) of rasters: For each folder located in /home/geodata/sentinel2/ look in subfolder IMG_DATA and merge the three rasters with ...
2
votes
2answers
577 views

Fast way to merge 8000 raster?

I have to merge almost 8000 rasters (TIF). I tried using Mosaic To New Raster in ArcGIS 10.3, but it's processing really slowly and crashes quite often. Is there a faster (or more stable) way to ...
2
votes
1answer
742 views

How to merge single polygons to multi part polygons by maximum distances?

I have a polygon layer with a land-use class and ID for every polygon. How can I merge polygons (into multi part polygon) which do not adjoin, but are not further than x meters apart from each other. ...
2
votes
1answer
6k views

How to merge output shapefiles in model builder

I have a layer with several polygons and a road map. I need to take each polygon and use it to clip the road map, dissolve all of the road records into one, and then merge the polygons into one ...
2
votes
3answers
162 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 ...
2
votes
2answers
161 views

Merging attributes in QGIS? [closed]

I have a layer with several polygons making up a division together. They all have attributes with population. Is it possible to add up the population in a merge so I don't have to use a calculator ...
2
votes
3answers
1k views

Keeping leading zeroes in QGIS in big files

I am trying to load a file with many columns into QGIS. With both .txt and .csv format the leading zeroes of some data values get lost. However, I need the leading zeroes to merge the file with a map. ...
2
votes
4answers
974 views

merge overlapping polygons with spatialite

The green points, buffered by one of the point attributes, should result in the three areas outlined in red (a table with three rows): I'd like to do it in spatialite. How can I do that? If it's not ...
2
votes
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 ...
2
votes
2answers
2k views

How to batch merge shapefiles

I have a catalog tree with a number of subfolders. In every folder there is point and polygon shapefiles. What I want to do is for every type of shapefile point and polygon to do a merge by type. ...
2
votes
2answers
71 views

Correcting merged LiDAR DEM with outliers in inner edges?

I've created a DEM from LiDAR data. After combining all the files, I could see that there are some problems through the tile borders. This is an screen focused in one of the cross section of 4 files ...
2
votes
1answer
88 views

Selecting multiple polygons - which polygon is top of the merge list?

If you select multiple polygons, and then try to merge them, ArcGIS creates the dialog box showing the selected polygons (picture below). You can then double click the one you want the others to merge ...
2
votes
2answers
6k views

Merging attribute and geometric features in QGIS?

I have polygons shapefile in which some of the polygons have same attributes as seen below:- In QGIS, how do I merge the polygons having the same attributes into one polygon? In other words, am ...
2
votes
1answer
118 views

Merge polygons based on five first digits in id

I have a shapefile with 1364 polygons in the Stockholm area: But the "areas" are too detailed - I want to make fewer and bigger polygons. I would like to merge/dissolve all "BASKOD2010" id's based on ...
2
votes
2answers
3k views

merging ecw images

Is anyone able to recommend a program/process/method for merging ecw images together. I have approximately 2000 ecw images (tile) that 1.5x1.5km each which together and put to combine them all ...
2
votes
3answers
1k views

Merging multiple rasters with the SAME spatial extent

So I began with lidar elevation data 1m resolution, and I performed a terrain analysis to extract specific ranges of elevation from the raster (1st picture is 0-1m elevation, 2nd picture is 1-2m ...
2
votes
1answer
482 views

Merge from arcpy.ListTables() producing duplicate rows?

I was trying to manually merge file geodatabase tables and was getting Null values for the output file rows and decided to write a python script to merge the files. Here's my script: import arcpy ...
2
votes
2answers
2k views

How to merge dbf files in Python or arcpy?

I have over one hundred dbf files to merge. Each of files have two columns: ID and another field which differs from one file to another. I want to merge those fields based on ID such that each raw ...
2
votes
3answers
2k views

Merge Multipart Feature Line

I'd try to merge multipart feature line, but didn't work. would you please teach me how to merge multipart feature line? I work in version environmental and geometry network. Regards,
2
votes
3answers
2k views

Merging large amount of polygon-features in script with GDAL/OGR Tools or Python?

We have a very large shapefile with over 30000 features and want to merge it with a script on a server. Currently we try it with QGIS, but the processing takes way too much time. Is there a way to do ...
2
votes
2answers
2k views

Inputting multiple featureclasses into Merge tool using ModelBuilder?

So I have 490 point fc's in a single directory with uniform spatial features, field names/datatypes. I'm trying to figure out how to consecutively input the first seven fc's into the merge tool, ...
2
votes
2answers
50 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 > ...
2
votes
2answers
60 views

Merge shapefiles with unequal field lengths

I have several shapefiles in ArcMap that I want to merge together into one shapefile so I don't have to keep juggling them all. However, I can't use the Merge geoprocessing tool because it gives me a ...
2
votes
1answer
161 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 ...
2
votes
1answer
298 views

Packing tiled rasters into a Geopackage in QGIS 3.0.3 whilst maintaining the colour

I have a folder containing 79 tiled Geotiff rasters making up a basemap of the UK. My goal is to efficiently store these in a Geopackage which already contains some vector data also used for base ...
2
votes
1answer
265 views

Merging two spatial objects in R: spCbind gives error “row names not identical”

I have two SpatialPolygonsDataFrames. One is the LSOA shapefile of Great Britain (i.e., Great Britain divided into ~41,000 regions with approximately equal population densities), the other is a bunch ...
2
votes
1answer
70 views

ArcGIS10.5.1 Data Merge error: 000732

I am trying to run a python script to merge some files in a folder test, called test1.shp, test2.shp, test3.shp. The code is this: import os import arcpy workspace = "C:/mypath/test/" ...
2
votes
1answer
767 views

pyQGIS Merge raster layers

I want to merge raster layers I have created in different software (SNAP). I know about merge tools in QGIS (qgis merge and gdal merge). I have problem with null values in the rasters which were ...