Questions tagged [area]

Area is a quantity that expresses the extent of a two-dimensional surface or shape, or planar lamina, in the plane.

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DB2 ST_AREA function with SRID: 4326 returns wrong units

On any other database system with a an SRID of 4326, ST_Area returns a value in meters. However, DB2 returns decimal degrees by default. I get that I can specify meters as an argument but why return ...
Yndigo Dream's user avatar
4 votes
1 answer
85 views

Splitting polygon based on given proportion of its area in PostGIS [closed]

The problem I am trying to solve is to divide a given polygon into smaller polygons based on a given input number (proportion of the polygon). In this example, the desired output would be a ...
Belén F.'s user avatar
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ArcGIS Pro: merge small polygons with their larger enclosing polygons

Polygons with an area size below a certain threshold should be merged with their enclosing polygons within the same layer. The image shows several cases in one example: in case of a threshold of 700, ...
stonebe's user avatar
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How ArcMap calculates area of polygon?

I am working on a project to compare between calculating the area of ​​a polygon using Google Earth Pro and using ArcMap 10.8, and the methods used by the programs for that. How does ArcMap 10.8 ...
No Na's user avatar
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Calculation surface area for every cells [duplicate]

Surface area= Plan area /cosine (in Radian) slope. I used cell plan area by multiplying cell size for example 12,5*12,5=156,25square meters Surface Area = 156,25/cosine slope result became surface ...
Mojtaba's user avatar
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18 views

Calculating area of GeoJSON features within Vector boundaries

I am attempting to calculate the area of total building footprints within each census block group within a state. The building footprints are a .geojson file type and my census blockgroups are a ...
Pierce_h's user avatar
1 vote
0 answers
31 views

How do I calculate the area of different land uses from one shapefile into a different set of polygons?

I'm using ArcMap10.8.2 and was trying to use Tabulate Area but I either didn't use it right or it is the wrong tool for the job. I've attached an example image. I am trying to get the area of each ...
Duck's user avatar
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Import error with using QGIS Native functions in Jupyter Notebook environment

I want to calculate area of all polygon features using Field Geometry function of QGIS 3.22 version. But somehow it always gives an import QGIS error, but when I tried to do a simple buffer of a ...
soumik chakraborty's user avatar
3 votes
1 answer
102 views

Creating polygon with one third of world surface using R

I would like to create a polygon with (roughly) one third (or any other fraction) of the worlds surface. I assume I should use an equal area projeciton like Lambert cylindrical equal-area, robinson or ...
Lenn's user avatar
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In GEE: Calculating area in WGS84 masking out regions with layers in different resolutions

I am trying to calculate the number of affected people by flooding, but only those who are living in urban areas. So essentially, I take the WorldPop dataset and overlay it with flood extent and land ...
vince's user avatar
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1 vote
1 answer
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Calculate the area of a county bounded by a polygon in Google Earth Engine

As shown below, for the state of Texas, a portion of Bexar County is bounded by the given Polygon. I want to calculate the area of Bexar County contained within the Polygon. Here's the code to draw ...
Ramaraja's user avatar
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2 votes
2 answers
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Calculating the average of one field dependent on another in QGIS

I have a land use shapefile, which has a column: labelled "LU_1", categorising different areas quite broadly (9 categories total, they are numbered 1-7, U and V). There's also a field with ...
OFLO's user avatar
  • 21
3 votes
2 answers
154 views

Looping area calculations for multiple rasters in R

The following code works great on individual rasters and gives me the information that I want: r<-rast("LuckSpring_2001.tif") activeCat(r)<-"Class_name" r f <- freq(r) f$...
bigblue5295's user avatar
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How to calculate the polyline area in QGIS

How to calculate the polyline area in QGIS?I have the width and length and I want to calculate the area of the river using that information so I can redraw my river using the area size calculated. ...
Nurul Nabilah Mahmud's user avatar
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1 answer
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Find the area of a raster created from drone data

I am trying to find the areas for a series of drone captured mosaic tiff data using ArcMap 10.8 which are irregular in shape. I have tried using Raster Calculator and multiplying by 0 to then use the ...
Karyssa's user avatar
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Intersect Area service with points

I'm making a map viewer for my university final work but I have no clue of coding. I've been following the ESRI Dashboard tutorials and I've arrived to the code as I have it now. I have two buttons, ...
Stukero's user avatar
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Land allocation to polygons with specific areas within a boundary

We are looking for a solution to create novel land allocations of an existing area into a subset of polygons for each allocation within the existing space. A high level overview of the requirements ...
mattscooter's user avatar
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1 answer
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Creating Multiple Instances of Measure Line

I'm trying to use multiple instances of the Measure Line and Area at the same time. More specifically, I need to measure setbacks from lot lines. The way Measure Line is set up, it becomes quite a ...
user224918's user avatar
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42 views

QGIS area calculation disparity in identify feature vs PyQGIS

I have a single polygon layer in two different CRSs. I noticed the area calculations are way off between the two CRSs. EPSG 2284 and 5070 I have attached both layers. https://file.io/LRW3NniQU4ji The ...
ar-siddiqui's user avatar
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2 votes
1 answer
151 views

Extracting area of the clusters of specific coordinates

I am working in GEE and I am trying to extract areas of clusters for some specific coordinates. I have a clustered map of the area of all the clusters (using object-based clustering) and a list of ...
th145's user avatar
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1 vote
2 answers
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Mergin Maps measure function available

Project works find. I use Mergin Maps on Windows 11. But I need an essential function: Measure area and lines Is there no function for that?
Volk_a's user avatar
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Difference in calculating areas between Apache Sedona and GeoPandas

I am currently working on a project that involves calculating the area of a circumference with a radius of 0.001 degrees -created via buffer-, centered at latitude -4 and longitude -63. The resulting ...
Lucas Corbanez's user avatar
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0 answers
44 views

Polygon on scratch or shapefile area returns null in QGIS & EPSG3857

Just got started with QGIS (the software) today and I'm getting Null for a hand-drawn polygon, even for a circle shape. Here is what I've done: Installed QuickMapServices plugin Installed GeoCoding ...
marciokoko's user avatar
1 vote
1 answer
77 views

Polygons area calculation in one shapefile with different zones (ArcMap or Google Earth Pro)

My country is extended to 4 zones so for calculating area I must set data frame properties in ArcMap (projected coordinate system). I have one shapefile with many polygons (about 300 polygons). I add ...
coral's user avatar
  • 79
2 votes
2 answers
82 views

Calculate overall area of physically discrete raster areas in QGIS

I need to get the overall area of physically discrete areas of a raster layer up to a given cell count in QGIS. The following approach is what I've tried so far, but it seems a bit too complicated and ...
winnewoerp's user avatar
1 vote
1 answer
50 views

Area calculation of classified raster layer

I am working with QGIS 3.22.4 and want to analyse the output of MaxEnt. Therefore, I have a raster layer showing the habitat suitability for my species in the whole oceans as .asc-data type. I have ...
Ben's user avatar
  • 13
-1 votes
1 answer
120 views

Calculate the average "radius" of a polygon in ArcGIS Pro

I am trying to calculate the average radius of RF coverage propagations. Each propagation looks almost like a paint splatter for visual reference. I want to calculate the average radius across all of ...
Noah P's user avatar
  • 41
3 votes
2 answers
170 views

Correct CRS for determining the area of my polygon in QGIS

I need to get an area of a polygon. The polygon when in GDA 2020 (7844) and GDA 2020 / MGA Zone 50 (7850) lead to significantly (20 hectares) different areas. The method for getting the area I am ...
Nick Tidmarsh's user avatar
0 votes
1 answer
64 views

Adaptive polygon division in QGIS

Let say I have an irregular polygon layer that I want to divide into squares of fixed size (i.e. 50 x 50m). The simplest solution is to create a grid based on the polygon extension and then use the ...
flisior's user avatar
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QGIS Delete holes "Remove holes with an area less than" is not working

In QGIS, both Windows 7 and Ubuntu, older and latest versions, I have used r.to.vect to create a GPKG polygon layer. When I try to delete holes below a certain value, all the holes are deleted, even ...
Dr Richard Langford's user avatar
2 votes
4 answers
223 views

QGIS: Calculating the area of category overlay between 2 shapefiles

I have 2 shapefiles (A & B). The polygons in layer "B" are categorized into 8 categories (1-8) and I want to add 8 columns in layer "A" with the areal distribution of the ...
he_could_be_any_of_us's user avatar
0 votes
1 answer
87 views

Detecting Land Use Land Cover Changes from Copernicus Corine Maps in GEE - Calculating Areas of LULC Change Pairs

I'm trying to detect land use land cover (LULC) changes between 1990 and 2000 using the Copernicus Corine land cover maps in Google Earth Engine (GEE). However, I'm unable to find change maps in the ...
Gencergis's user avatar
  • 109
1 vote
0 answers
62 views

Calculating slope-adjusted surface area from DSM

Is there a (simple) way to calculate the surface area from a regular DSM raster considering the slope/aspect? In my case I've got a DSM (0.5m resolution) with a building, I would like to calculate the ...
EJH's user avatar
  • 11
9 votes
1 answer
141 views

Deleting parts of MultiPolygon based on area using PyQGIS

I have a layer with MultiPolygons. Some of them have parts less than five m2 which I want to delete. The QgsGeometry class has methods: parts() and deletePart(self, partNum: int). On parts() I can ...
ThiPa's user avatar
  • 595
1 vote
0 answers
69 views

How to get correct area in QGIS in local coordinate system?

I vectorized a small area (75,000 square meters in reality) in QGIS in the local coordinate system. +proj=tmerc +lat_0=0 +lon_0=38.48333333333 +k=1 +x_0=1250000 +y_0=-5712900.566 +ellps=krass +towgs84=...
Sergey47's user avatar
1 vote
1 answer
37 views

Calculating Area of each Classes by Region in GEE?

How could I calculate the area for each class of GHSL built-up layer for each district? I have tried the following code, but it doesn't work, and I don't know why. Here is my code: var countries = ee....
Gencergis's user avatar
  • 109
1 vote
0 answers
58 views

Calculating equal area latitudinal bins

I want to generate a simple function for producing equal-area latitudinal bins based on a desired number of bins. I've come up with a bit of a dirty solution which seems computationally expensive and ...
Lewis's user avatar
  • 11
0 votes
0 answers
52 views

QGIS Plugin "Area Weighted Average" 0 is not in range

I'm a beginner in QGIS and I'm trying to calculate the population density. I have two layers, one layer with population attributes and one grid layer where my population data should be weighted and ...
becqui's user avatar
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1 vote
1 answer
38 views

PostGIS concatenating tables with different SRIDs side-effects for area

I am quite new to Postgres/PostGIS and have an open question regarding 'mixing' tables with different SRIDs. I know this is generally not recommended, but in my case, I will already be required to ...
Bullfrog3655's user avatar
0 votes
0 answers
49 views

Global surface water/ How to compare area of latest image to older images and generate histogram

Based on the Global surface water script, I would like to compare the water decreasing per year and plot a histogram for the area lost per year. I know that there is a dataset that goes by monthly ...
Rene's user avatar
  • 1
1 vote
0 answers
32 views

Identify largest class in area

I have a layer of polygons with different land uses, and another layer of polygons with administrative areas. I'm trying to find a way to determine which land use is dominant (in terms of area) in ...
Jake's user avatar
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1 vote
0 answers
34 views

Calculating areal distribution of soil types within catchment layer in QGIS

I have two polygons: Layer with +100 river catchments Soil type layer (8 different soil types) I want to calculate the areal distribution of soil types within each river catchment. Areas should ...
he_could_be_any_of_us's user avatar
4 votes
1 answer
75 views

Measuring study area of elevational ranges in raster file in QGIS

I have a DEM layer with elevation ranges of -413-5593 m, just as seen below. Then I determined the altitude between 4100 and 5400 m using symbology and band rendering, got the map below and the ...
Sina Kh.'s user avatar
  • 153
3 votes
2 answers
87 views

AttributeError when calculating area in hectares in PyQGIS

I want to calculate the area of the polygon and add it to the attribute table as another column. I used this script: from qgis import processing inlayDir = iface.activeLayer() P3_boundary = r'C:\...
PyCher's user avatar
  • 171
0 votes
0 answers
54 views

Divide areas from two vector layers

I'm using QGIS, and I have two vector layers (with polygons), I'd like to get the % of area of polygon in layer b respect to polygon in layer A, and for that I want to calculate the area of a layer A ...
Abdelmalek Temnani Rajjaf's user avatar
1 vote
1 answer
218 views

Calculate poygon area in km2 from degrees to km2 in R

I found this but I think it is possible. I am trying to calculate the area in Km2 of a polygon given by the vertices in degrees: library(pracma) x= c(-40.03953, -44.24278, -40.90583, -35.55361) #those ...
João Vieira's user avatar
0 votes
1 answer
103 views

Using raster cell area in a calculation using Python [closed]

I have a large raster full of integer values (1-20) and want to calculate the total area of cells of each value using Python. The raster spans a wide range of latitudes and so the area of each cell is ...
FasterRaster's user avatar
0 votes
0 answers
28 views

Compute the area of differents buildings for differents regions in GeoPandas

I'm really new to GeoPandas so this question may have already been answered (I hope not). I have a GeoPandas dataset with points that represent the coordinates of buildings and I would like to ...
Pierrick Bournez's user avatar
4 votes
1 answer
73 views

Add polygon areas by roof orientation condition

I have a shapefile with building poligons and a raster file with the roof orientation (0-360º). I would like to assign the orientation to the building shapefile using QGIS. I converted the raster file ...
Ricardo Gomes's user avatar
3 votes
2 answers
396 views

Calculating the area of an intersection in PostGIS

I've got two tables in a PostgreSQL/PostGIS database, blue and purple, both holding polygons: Now I need to calculate the overlapping area, for each polygon of the blue grid with only one of the ...
jpinilla's user avatar
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