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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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Calculating Area of 2D Shape in 3D space

With ArcGIS Pro, I want to calculate the area of a roof. I have LoD2 building data and have only exported the roofs. These roofs have a 2D shape but are situated in a 3D space. When I calculate the ...
obrob's user avatar
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1 answer
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Measure area of a polygon on OpenStreetMap

How can we measure the area of a polygon on a OpenStreetMap map? It can be either: the area of a hand-drawn polygon, the surface area (at ground level) of an existing building It seems the standard ...
Basj's user avatar
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2 answers
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Creating rings with buffer as polygon in QGIS [duplicate]

I need to draw circles with a buffer in one view. It will be an area around cities. I think it can be solved with a buffer or a cutout from the circle. How can I do this?
Marek Drličiak's user avatar
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32 views

Find area of patch if two vector files overlap

I have two vector files containing polygons. I want to calculate the area of polygons in add if they are touched by polygons in re. I have tried but I only find the area of the intersected area, but I ...
Thomas's user avatar
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Real Time Area calculation while drawing polygon in ArcMap

How can I visualise real-time area while drawing a polygon in ArcMap 10.8? I mean, when we draw a polygon in Google Earth Pro, it shows real-time area with each drawing vertex.
Raja Fahad's user avatar
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Tool or plugin in QGIS that allows seeing measurements/area of polygon/line while drawing it

I am looking for either a tool or plugin in QGIS that allows me to view measurements and/or area while creating a ploygon/line. I know I can measure it afterwards, but I am specifically looking for a ...
Maja Thuren Jørgensen's user avatar
0 votes
1 answer
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Different area values for same polygon in ArcGIS Pro 3.2.2 vs QGIS 3.28.4

When I calculate the area of a polygon in QGIS using the area($geometry) function in the field calculator (and also when using the "add geometry attributes" function in the processing ...
Nostromo426's user avatar
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1 answer
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Calculating group area percentages in ArcGIS Pro using Summarize Within

I have a grid (vector file) in ArcGIS Pro, and I want to calculate the percentages of the area of different anthrome types in another vector file (Anthromes 12K DGG Dataverse) for each grid cell. I ...
cloudberry's user avatar
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20 views

Absurdly large area estimates when extracting landcover area for individual polygons (CORINE Data)

I want to extract area under different CORINE classes as a part of my master's thesis. I am facing problems with the area estimates that QGIS calculates for landcover classes from the CORINE dataset ...
Tanvi Gurjar's user avatar
1 vote
0 answers
82 views

QGIS ellipsoidal area values changing very slightly between calculations while planimetric values stay the same

I have a number of vector shapefiles that I need to calculate the geodesic/ellipsoidal area for. These shapefiles are accessed and updated regularly, with the area recalculated each time they are ...
ecoQs's user avatar
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How to calculate the area of each grid cell of a raster in Python?

I have a square raster of size, let's say, 100x100 cells, with each cell being 200m X 200m. This raster is not in an equal-area projection, but is centered on the North Pole, meaning the actual area ...
Marcus K.'s user avatar
  • 141
1 vote
2 answers
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QGIS Count values between two numbers inside a polygon in another layer

I have 2 layers. LayerA are multiple polygons of the area that i'm evaluating (Red boundarys). LayerB is a MSAVI raster to vector with the data (multicolor greens - blues). I want to calculate the ...
erichnagy's user avatar
3 votes
2 answers
161 views

Calculating information for selected parts of the polygon with PyQGIS

I have a polygon that is formed using Quick OSM. After that, I add an area calculation field to it, automatically using the QGIS tools. How can I use PyQGIS to get the sum of the areas of the ...
Чайный Бублик's user avatar
1 vote
0 answers
104 views

Finding the name and area of layer under buffers

I am new to QGIS and am using version 3.34.2 (Prizren). I am using two files to accomplish a couple of tasks (explained below). The first file shows the outline of groups of villages (gram panchayat [...
Ramandeep's user avatar
3 votes
1 answer
142 views

How can Cartesian and ellipsoidal perimeters and areas be so different in an EPSG:3857 layer?

For a particular polygon of mine in a "EPSG:3857 - WGS 84 / Pseudo-Mercator" layer, the derived measurements QGIS reports are: Ellipsoidal perimeter: 1015 m Cartesian perimeter: 1218 m ...
Geremia's user avatar
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How to find an Area of Interest in ERDAS and is there a way to make them stand out?

One of the things I've been doing is creating AOIs (Areas of Interest). They were supposed to be at least 30 pixels in size. However, I have lost track of one of them which was classed as "...
Peter Watson's user avatar
3 votes
2 answers
465 views

Intersection in geopandas takes long time to execute

I got two dataframes in GeoPandas Python. One table contains around 2.2 million rows of data (geometry type is Multipolygon) and other table contains around 3800 rows (geometry type is Multiplygon). I ...
user2293224's user avatar
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0 answers
18 views

Buffer: shape_Area=0

I used the GPX to feature tool to add data points to my map. I draw buffers with a different radius around each point >10 m (some of them overlap). However, the column shape_Area is 0 for all the ...
Daniela's user avatar
2 votes
1 answer
104 views

Determine area enclosed by multiple segments

I am trying to determine the area enclosed by multiple linestrings. For example, in the following picture, I have 4 linestrings, forming 2 closed polygons. I'd like to be able to get the coordinates ...
arno's user avatar
  • 43
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1 answer
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Why is my code for flood pixel area calculation timing out?

I have made a flood map of Bangladesh following a tutorial. I am trying to determine the flood-affected land area by calculating pixel area. The map is displayed fine and the code for total area ...
Mosh's user avatar
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1 answer
260 views

Calculate area under each class for a feature in a shapefile

I have a shapefile that you see in attached picture and you can see it has eight classes for a feature shown in picture. How do I calculate area under each class. I would like to export area ...
QGIS_krig's user avatar
0 votes
2 answers
75 views

Rasters not having the same total area for classes within the same study area

I have multiple rasters for various data: LULC, Elevation classes, Slope steepnees classes, Soil types. All those rasters have the same properties: all have the same number of columns and rows; same ...
gis1234's user avatar
  • 319
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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
134 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
0 votes
0 answers
99 views

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
  • 447
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0 answers
48 views

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
  • 1
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0 answers
12 views

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
0 votes
0 answers
51 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
35 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
  • 21
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1 answer
110 views

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
119 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
  • 1,287
0 votes
0 answers
123 views

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
  • 17
1 vote
1 answer
138 views

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
  • 135
2 votes
2 answers
118 views

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
237 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
0 votes
0 answers
124 views

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
0 votes
1 answer
31 views

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
  • 21
0 votes
0 answers
16 views

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
0 votes
0 answers
61 views

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
0 votes
1 answer
64 views

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
0 votes
0 answers
47 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
  • 1,748
2 votes
1 answer
308 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
  • 25
1 vote
2 answers
140 views

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
  • 11
0 votes
1 answer
462 views

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
0 votes
0 answers
52 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
283 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
  • 81
2 votes
2 answers
127 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
  • 1,504
1 vote
1 answer
162 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
375 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
  • 59
3 votes
2 answers
392 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

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