Geographic Information Systems

Questions tagged [combine]

Ask Question

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

74 questions
Newest
Active
Bountied
Unanswered
Filter by
Sorted by
Tagged with
0
votes
0answers
17 views

How to add z value vertices from a point layer to a line in QGIS?

I created a point layer from a line using Vector geometry/Extract vertices in the Processing toolbox. The purpose is to extract the elevation from a DEM into the points corresponding the vertices and ...
0
votes
0answers
10 views

How to combine high-resolution DSM for open areas with low-resolution DTM for forests and buildings into final DTM

I have high-resolution DSM (10 cm/pix) of quite a big area (around 20 km^2) from UAV and I want to make DTM, my result is TIFF created in photogrammetric software. But there are forest and building, ...
-1
votes
1answer
36 views

Mosaic 70 rasters to a new raster

Hi I have 80 rasters that I want to combine with Mosaic to new raster. 1- is the order of adding inputs important ? Is there any quicker way to add all those rasters ?]1]1
0
votes
0answers
16 views

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 ...
0
votes
0answers
39 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 ...
0
votes
1answer
48 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?
0
votes
1answer
70 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 ...
0
votes
1answer
50 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 ...
3
votes
1answer
228 views

Difference between two vector layer

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 do that. In ...
2
votes
1answer
373 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 ...
2
votes
1answer
348 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 ...
1
vote
0answers
34 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 ...
0
votes
1answer
361 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 ...
2
votes
1answer
51 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 ...
2
votes
0answers
93 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 ...
0
votes
0answers
135 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 ...
1
vote
1answer
84 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 ...
0
votes
2answers
59 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 ...
2
votes
0answers
254 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 ...
0
votes
1answer
642 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?
0
votes
1answer
68 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 ...
1
vote
0answers
73 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-...
1
vote
3answers
3k 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 ...
2
votes
3answers
2k 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 ...
1
vote
0answers
182 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 ...
1
vote
0answers
53 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?
2
votes
1answer
591 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 (...
0
votes
0answers
40 views

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 ...
1
vote
0answers
339 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 ...
1
vote
1answer
158 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 ...
0
votes
0answers
41 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 ...
1
vote
1answer
180 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 ...
0
votes
1answer
1k views

Combine points in QGIS

I have some points and vector grid in .shp files. I need to combine points which are in the same cell(or cross cell) and sum their values. How can I do this in QGIS?
2
votes
0answers
201 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 ...
1
vote
1answer
534 views

How to merge a overlapping points into a single feature to reduce Map “noise”

I have a shapefile of the locations of wind turbines within the central flyway. I was attempting to show the size by the total number of turbines however I am having a problem with many large scale ...
2
votes
0answers
50 views

Is there a PostGIS equivalent to ESRI Spatial Analyst COMBINE?

The ESRI Spatial Analyst COMBINE tool accepts multiple raster inputs and outputs a new raster with a unique number corresponding to unique combinations of values from the inputs. It also provides a ...
1
vote
0answers
62 views

Combine two rasters sets using weighted geometric mean

My question is: How can I combine two to four raster layers using weighted geometric mean? I am using ArcMap 10.3. I want to use the weighted geometric mean since it nicely reflects a situation when ...
1
vote
0answers
98 views

Sort a Raster attribute field in ArcGIS

I need to combine several rasters. One of them has an alphanumeric data in the attribute I need to combine. However, when combined the output raster has a 'LONG' attribute type where should be 'STRING'...
0
votes
1answer
85 views

Aggregating multiple layers while preserving values using ArcMap?

I am using ArcMap 10.5 to display the distribution of Revenues by Region, for each product I have defined. Each product has a layer of its own consisting of a collection of polygons, and each polygon ...
1
vote
1answer
201 views

Combining > 20 rasters in ArcMap

I have 30 rasters with 0 and 1 values and I want to combine them into a single raster using the combine tool. However, combine tool has a 20 raster limit, so my here is my current approach and code: ...
1
vote
1answer
161 views

Combine / Group - ArcGIS attributes table [closed]

I need to group several rows in a single one, combining data cell (mainly “text”) in Arcgis desktop 10.2.2. One cell could have several records separated by comma. I have attached a screenshot in ...
0
votes
1answer
106 views

Dissolve adjacent polygons into collections of larger polygons, rather than a single überpolygon

I have a county's worth of census tracts, and I need to combine adjacent tracts into larger polygons. Here's an example of what I'm looking for: This is four smaller tracts combined into a single ...
2
votes
1answer
64 views

How can I create a csv file starting from a layer with some boundaries to a layer with others boundaries?

I have a vector layer with the definition of the blocks of the state of NY, and I have another vector layer with the definition of the group blocks of the state of NY. They are two different vector ...
1
vote
3answers
176 views

Integrating raster datasets using ArcGIS for Desktop?

I have two raster datasets. One raster dataset shows population density, with the range of population density values given a score from 1 to 10. The score is entered into a separate column. The ...
2
votes
2answers
389 views

Seeking tool in QGIS similar to ArcGIS Combine?

I am wondering if there is a way/tool in QGIS (2.6) could produce similar output as ArcGIS "Combine" tool does. I am trying to integrate values from overlapping rasters, and then create a single ...
1
vote
0answers
75 views

Combining two rasters into heatmap using QGIS? [closed]

How to combine two rasters so that the heatmap is following according to the relief or shade layer (so that it does not look patched)?
3
votes
2answers
2k views

How to mix two raster in R (same extent)?

I want to produce one PNG image for each country in the world. The pixel colors come from a raster that describes the vegetation, and the boundaries of the countries come from a shapefile. I managed ...
2
votes
1answer
460 views

R and osmar : How to merge two adjacent osm files with overlapping nodes and ways?

Due to a problem loading large osm files in osmar, I have decided to split my osm file in small parts, load them individually and the merge them. I currently face two problems : The code splitting ...
1
vote
1answer
270 views

How to combine two QML files?

I am making a plugin. I have two QML files for the same layer and column. I want the plugin to combine the two existing files into a new QML file and then I will select which one symbol for each value ...
1
vote
2answers
342 views

Combining different geometry types in ArcGIS for Desktop?

Two geodatabases have been created using split by attribute tool from CAD drawing file. One gdb is from polyline layer and another from polygon layer of input drawing file. I want to combine ...

1
2