Questions tagged [combine]

For questions concerning methods and best practices for combining data of different sources, resolutions, or formats to produce new information.

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How to combine two vector layers into one combined layer?

I made two layers for heat stress (PET) and flooding risk. I normalized both maps into a 0-100 scale. The number 0 means a low heat stress/flooding risk and 100 is a high heat stress/flooding risk. To ...
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1 vote
1 answer
28 views

Using combine function in QGIS modeler

I am trying to use the QGIS modeler with the 'combine' function, but when I run the model, it only gives me one choice of shapefile to choose instead of letting me choose more than one raster to ...
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Combine two raster datasets from different areas - xarray

I simply wish to combine two raster datasets from different spatial extents and with different coordinate reference systems using python. Eventually, I wish to combine enumerable datasets, but ...
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37 views

QGIS intersect or summary function not working precise enough?

For my thesis I am trying to convert some data using QGIS. I have: A vector layer with all the parcels of a municipality as polygons and a layer with all the buildings in said municipality as 2D ...
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Google Earth Engine combine image collections with different recording times

I am trying to combine my MODIS (recorded every 8 days) and Daymet (recorded every day) dataset, focusing only on Iowa. In the code below, I reprojected the datasets so that the pixels will be the ...
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1 answer
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Combining Band Data

I recently downloaded Landsat 8 and 5 imagery from Earth Explorer, but my problem is that all of my data bands are separate and not composite. Does anyone have any advice for getting them to combine ...
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-1 votes
1 answer
62 views

Manual classification combining bands and defining values in GEE

I would like to perform some manual classification on a single image of S1-data which is fairly simple: either a pixel is classified as 'Water', or it is classified as 'Land'. I did these ...
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223 views

Combine nearby points into single point with average location in ArcGIS Pro

I've added GPS waypoints to my ArcGIS Pro map using the GPX to Feature conversion. However, some points are clearly "duplicates" of the same location because they are so close together. (...
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2 answers
62 views

Combining FEMA Flood Zones to CSV coordinates in QGIS

I'm new to QGIS but have to do some combining of data for my thesis. I have successfully imported two datasets. One is the ArcGIS server for Flood Zones in the USA: (NFHL: https://hazards.fema.gov/gis/...
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4 votes
2 answers
707 views

Combining point and polygons layers using QGIS

I'm currently trying to compare species sample points vs their actual geographic range. I have: a points layer with species names and each species has multiple corresponding points/records a polygon ...
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1 answer
214 views

How to combine two objects in an ee.List() Earth Engine

I have this type of list in Google Earth Engine: var list = ee.List([[{'class': 1, 'sum': 27188.96}, {'code': 'Cloud'}], [{'class': 2, 'sum': 1190.15}, {'code': 'Soil'}]]) and ...
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70 views

Combining training datasets extracted from different images in Google Earth Engine

in Google Earth Engine I would like to combine training datasets extracted from many different images (same area but different years). I would then perform a random forest classification. How can I ...
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1 answer
341 views

Importing Excel data to polygon Layer using ArcGIS Pro

I am using ArcGIS Pro. I have a polygon layer (65 features) saved. My colleague has made an Excel sheet with a number of different columns with different attributes on each feature. Is there any way ...
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0 answers
50 views

Combine Polygon and Point Layer

Is it possible to combine a point and a polygon layer in one layer from a shapefile in QGIS?
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1 vote
1 answer
49 views

Categorising raster data based on shapefile boundaries

I've tried searching for an answer but honestly I'm not even sure how to word my search. I'm using Arc GIS Pro. I have two layers that I want to analyse. The first layer is a shapefile and it covers ...
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1 vote
2 answers
57 views

Raster math between image collection and image in GEE - use .map function?

I am currently working with a raster file which shows peatlands in the Congo Basin and the ESA/CCI/FireCCI/5_1 image collection (images for each month between 2001-2019). My end goal is to create ...
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1 vote
1 answer
55 views

Combining parcels that are adjacent and add up to more than 10 acres

I am using ArcMap 10.7. My task is to find a site to be developed for parking. Sites are supposed to be greater than 10 acres. But we can also look at adjacent sites that add up to 10 acres. I read ...
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2 votes
1 answer
1k views

Why use st_union after st_combine with sf?

The documentation of the st_union function of sf is not clear (for me!) on one point: what are the action and result of the function when applied to an sfc with a single feature, with the parameter ...
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1 vote
0 answers
300 views

Combining two areas on a shapefile (two polygons) into one

I am trying to combine two polygons or areas on a map into one. I have added a field called region to try and dissolve the borders by region. This did not work. I am now trying to combine them ...
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-1 votes
1 answer
126 views

Mosaic 70 rasters to a new raster [closed]

I have 80 rasters that I want to combine with Mosaic to new raster. Is the order of adding inputs important ? Is there any quicker way to add all those rasters ?
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How can I combine multiple raster datasets with multiple unique values in ArcMap 10.6?

I have to combine plenty of raster datasets. The problem is there are to many unique values. I guess that’s because there are layers where areas have geometry and there are not geometry on the other ...
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44 views

Combine 8 different shapefiles into 1 with combined attribute fields

I am working on a project where I want to add the attribute fields of 7 different shapefiles into 1 base shapefile. Specifically, I have a parcel map of a city, and I want to append attribute fields ...
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1 answer
124 views

What is combine function in QGIS?

There is combine function is ArcGIS which combine multiple raster value attributes in one raster layer. I would like to know what's the same process in QGIS?
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0 votes
2 answers
392 views

Combining two scenes with different extents without overlapping in QGIS

My AOI is split between two Sentinel-2 scenes. These rasters do not overlap. So function 'merge' in the Raster menu of QGIS cannot help - it says 'Layers do not have common extent'. How to combine it ...
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0 votes
1 answer
70 views

Carrying information from one shapefile to another based on location using ArcMap

I am a R user but I couldn't do this on R and decided it might be easier on ArcMap but I don't know how to use it that well. I have two shapefiles for same county, one of them has 360 features but ...
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5 votes
0 answers
339 views

Finding difference between two vector layers using QGIS [duplicate]

I have two vector layer land cover for 2016 and 2018. I want to get result layer that will show changes in land cover e.g. the forest has changed into a meadow. What option in QGIS can I use to do ...
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2 votes
1 answer
917 views

Why does fasterize gives different output for multipolygons with and without internally resolved boundaries?

I was thrilled to be clued into the package fasterize, which speeds up the rasterization process in R tremendously. However, I cannot figure out why the fasterize() function outputs two different ...
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2 votes
1 answer
1k views

Combining overlapping rasters in ArcGIS

I have two DSM rasters, one is 10km radius photogrammetric data, the other is 2km radius LiDAR data, both centred around the same point. I need to combine these together, essentially inserting the ...
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1 vote
0 answers
86 views

I want to combine or merge rasters

I am combining many rasters using a "barcode" that describes attributes for each cell. Combine works on integer values: I combine multiple layers using "combine" tool, then create the bar code by ...
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1 answer
912 views

Join CSV data to a raster file in QGIS

I am trying to join three data files to a raster grid: I have environmental data in the centre of each grid cell (delimited text layer), Sightings (delimited text layer), effort points (delimited ...
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2 votes
1 answer
61 views

Merge/Dissolve Polygon overlapping within

I have a polygon that has been broken down to an intersecting analysis point. Each segment has its own acreage within an acre field on the attribute table. I want the intersecting lines to be removed ...
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2 votes
0 answers
131 views

Combine two raster maps with transparency

I have two maps in geotiff format for exactly the same area with exactly the same geoinformation. The first one is a real land map, the second one is a satellite picture with clouds (rgba where alpha ...
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0 answers
212 views

.nc file flipped and rotated in qgis, no CRS, need to be able to project properly to make a masl

I have two separate files, one is my Land Surface Temperature and the other is the Grid with the lat/lon both are .nc I wanted to add my grid, which comes in as an attribute table, to my Land Surface ...
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1 vote
1 answer
156 views

Seamlessly combine map layers (fill the gaps of one layer using the second one)

I am creating air quality maps using two approaches. One of them gives slightly better results when validated against measurements but there are significant spatial gaps present in the output. The ...
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  • 668
0 votes
2 answers
69 views

Return values from combining different fields

I'd like to classify parcels according to combinations of front setbacks and side setbacks. I have a "Fr_sb" field with values 0 (no front setback) and 1 (with front setback), and a "Si_sb" field with ...
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2 votes
0 answers
412 views

Creating raster layers, weighting them, and combining them in QGIS [closed]

I'm looking to create raster layers from vector layers, rescale them, weight them then finally combine them for a final result. I'm really not sure about the process to do this. On Arcmap it's ...
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0 votes
1 answer
1k views

Combining polygon and raster using ArcGIS Desktop?

How do I combine the raster data and county outline polygon so that only the elevation data within the county boundaries is displayed?
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0 votes
1 answer
148 views

Combining features with multiple similar field values to one and adding unique values as new fields using ArcGIS Pro?

I am using ArcGIS Pro. I have a table with several objects that are identical with the exception of one field that has several unique values. How can I merge these multiple features into one and ...
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1 vote
0 answers
101 views

Creating population weighted spatial join of two layers with intersecting polygons using ArcGIS Desktop?

I have data where I sampled my outcome using a grid of 1-mile radii but my explanatory variables are at the census dissemination area level. I would like to average my census dissemination area-...
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2 votes
2 answers
5k views

Spatial join of multiple different point layers keeping all attributes in ArcGIS

I have 28 fairly large point data sets (1/6 degree global grid), all of different extents but with the same point location (previously extracted as centroids from raster pixel). Each point layer has ...
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3 votes
3 answers
5k views

Counting raster values in each polygon using ArcGIS Desktop?

I have a Watershed with ~100 smaller watersheds as a shapefile. I want to count the number of different land use values (they are in a 30x30m raster) in each of the small watersheds. I tried ...
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2 votes
0 answers
263 views

Combining (merging) neighbour points to one centred point in PostGIS (reducing density)?

I'm new to spatial algorithms and PostGIS functionality. Currently I have a Pg 10 + Postgis 2.4 database with table of more than 400 000 records (points with additional properties), with Node.JS tile ...
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1 vote
0 answers
64 views

Combine attributes (lines) within an attribute table QGIS [duplicate]

I have an attribute table with 100 LINES. The table has a DATE field. The 100 LINES have several DATE values. I would like to combine all LINES with the same DATE value. How can i do that?
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  • 543
2 votes
1 answer
2k views

MMQGIS Combine Layers OGR error: Can't create field

I am trying to combine about 20 shapefile vector layers in to one shapefile using MMQgis - but I keep getting the error below. Failure creating output shapefile: creation of field Bergen_FAC failed (...
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0 answers
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Displaying all townships a lake falls in

I have a shapefile for lakes, and one for townships. Both are polygon files and all lakes fall inside at least one township and I'm using ArcMap. I'm trying to find a way to quickly and simply ...
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  • 151
1 vote
0 answers
408 views

Combining touching polygons

PROBLEM STATEMENT I am trying, based on previous posts in this website, to combine polygons within the same layer but just when they touch each other by means of pyQGIS. It doesn't work (proper ...
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  • 185
1 vote
1 answer
338 views

Merging XML files [closed]

I am doing research about the city of Hamburg and I downloaded a dataset containing georeferenced point data of every house in Hamburg. The problem is that the dataset is made up of about 250 ...
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0 votes
0 answers
100 views

ArcGIS Combine Tool Returns Empty Atttribute Table?

I am attempting to combine six rasters using the ArcGIS 10.5 Combine tool. I ran this on three similar rasters and it worked. However, when I run with the new rasters it returns an empty raster with ...
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1 vote
1 answer
231 views

Creating prediction map by combining several rasters and vectors in ArcGIS Desktop?

I have three 'variables': 6000 GPS points that represent where my focal species (a carnivore) is present. Attached to these points is one value representing the activity level of the animal at the ...
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2 votes
0 answers
230 views

Determine Geometry of Multiple Layers in QGIS

I am sure this is a newbie question. I am importing a large number of layers into QGIS from a complex .kml file and need to combine into a single layer and finally save as a .shp file. I repeated ...
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