On a map, a closed shape defined by a connected sequence of x,y coordinate pairs, where the first and last coordinate pair are the same and all other pairs are unique.

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1answer
34 views

Assigning a value to a polygon cell

In ArcMap 10.3 I have a raster file with a polygon grid overlayed on it: If the pixels in the colored raster have values such as blue = 5, yellow = 1, green = 3 etc, is there a way to output a table ...
0
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1answer
52 views

How to convert a line shapefile to a polygon shapefile? [duplicate]

I am using Arcgis 10.1 and have an existing line shapefile that i would like to convert to polygons.
5
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2answers
129 views

Find lower left corner of a rotated polygon

I am currently struggling with a mathematical problem and can't seem to get it solved. I have a bunch of rotated rectangular polygons (solution should also work for non-rectangular polygons) in ...
1
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1answer
33 views

How to determine which points fall within a certain value in a polygon in QGIS?

I have a shapefile that contains different levels for food security. On top of that, I have mapped points for certain office locations. This is shown below. The country shapefile is extremely ...
2
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3answers
76 views

How to split a polygon by a polygon using PostGIS?

I've a large polygon (table_a) that contains a smaller polygon (table_b). Now I want to split the larger polygon by the smaller polygon. Unfortunately st_split(table_a.geom, table_b.geom) isn't ...
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0answers
94 views

CSV to Polygon.SHP with Python

I'm looking for a way to convert CSV file to polygons shapefile. I need to make polygons with defined size. In the CSV file, The first row is the length of each polygon and the first column is the ...
10
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1answer
251 views

Is there ArcPy tool for polygon resizing like Scale tool of Advanced Editing toolbar in ArcMap?

I am writing a python script for ArcGIS 10.3. I know about Scale tool in ArcGIS interface but I can't find such arcpy command. It exists? As you can see on the picture the Scale tool works different ...
2
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2answers
101 views

Using one polygon from feature class as clip feature in ArcGIS for Desktop?

Using ArcMap 10.3, I am trying to clip some features using a polygon containing many census boundaries. I only want a specific census area as the clip feature, so I only have that specific shape ...
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1answer
33 views

Is there any site where I can found city shapes in postgreSQL polygon format

Is there any site where I can found city polygon area (for postgreSQL or similar)? I don't know if such resources exists, and I don't know how to find it.
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0answers
37 views

Spatial results tab saying:One or more spatial objects were too large to display

I've saved country borders in my sql server 2012 as geography data from geojson files. It turns out that when I query all the boundaries that have an administration level 2, not all the polygons are ...
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2answers
50 views

Clipping a SpatialPoygonsDataFrame to another SpatialPolygonsDataFrame

How do I restrict a SpatialPolygonsDataFrame so that none of the polygons lie outside of an "underlying" SpatialPolygonsDataFrame? The application I have in mind involves Voronoi Polygons a la Carson ...
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1answer
73 views

Clipping raster in PostgreSQL?

I want to clip raster (SRID 32649) with polygon(SRID 4326) into SRID 32648 First I transform raster using query create view ras68 as select st_transform(rast,32648) as rast from ras69 Then cutting ...
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0answers
24 views

Split Polygon Layer by other Polygon layer in QGIS

I know there is a lot of previous posts to this subject, but I simply cannot find the solution I am after in the other posts. I have to following problem: I have two very extensive polygone layers, ...
2
votes
1answer
203 views

Calculate area of polygons using OGR in python script

I have a shapefile of many thousands of polygons. I'm trying to append an area field to the attribute table and calculate the area of each polygon (in sq. meters) driver = ogr.GetDriverByName("ESRI ...
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1answer
22 views

cannot get properties of multipolygon - mapbox/leaflet

I'm currently using mapbox with natural earth and geojson to populate a map with multipoygons and custom markers. Each of these has a set of properties and information that I need to display on click ...
2
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2answers
70 views

GeoJson to Spatial Geography in sql server 2012, fix orientation of polygon

I've download from Mapzen many geoJson files related to countries with their respective administration level. Then I've parsed all the geoJson files and saved them to my sql server 2012 as geography ...
0
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1answer
99 views

R: problem with rasterize getCover - not working

Are there any known bugs with the getCover argument in the rasterize function? (R package 'raster'). or has anyone got a fix for the following: I have a series of landcover polygons, here is a small ...
2
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2answers
67 views

clip raster to polygon with 3 srids

I have 70 raster landsat images with srid: 32647,32648,32649 and want to clip raster to polygon (shapefile, srid: 4326) in postgis. I imported all raster into 1 table with parameter -s : 32648, ...
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2answers
76 views

Can one row in an attribute table be linked to many separate polygons?

Can one row in an attribute table be linked to many separate polygons? I did a series of selects, buffer, intersects on some shapefiles and my resulting table has for one row many polygons. Can this ...
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0answers
20 views

Setting final orientation of polygons in CityGML model

I am converting shapefile model of buildings in LoD2 to CityGML. In CityGML really matter about poylgon orientation(Countercloskwise can be seen from outside, Clockwise from inside). I have problem ...
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0answers
30 views

Polygon overlay, calculating changes, in QGIS?

I'm trying to create a relationship file between two vintages of census tracts. (in this case, 2010 and 2013.) Reason being to load ACS (American Community Survey) census data and use weighted means ...
1
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0answers
21 views

Showing polygon in OpenLayers Timeline?

I am trying to use the OpenLayers TimeLine library with a kml file. I used the available example for kml in github, but it shows points instead of polygon. How can I display polygon the TimeLine ...
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0answers
61 views

Google map's place polygons. How are they defined? Can we export them (batch preferably)?

I am working on a project that requires an approximate estimate of the area associated with a place (e.g. city boundaries). The places may be individual villages to country administrative districts. ...
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0answers
24 views

Spatial join between polygons and polygons using R [duplicate]

I'm trying to make a spatial join in R between two SpatialPolygonsDataFrame's. In more detail, I have zip code and electoral precinct shapefiles, and would like to know how they overlap, i.e., for ...
2
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1answer
77 views

Calculate The Minimum Distance from Polygon Centroid to Edge

I am looking to calculate the minimum distance from the Center of a polygon (A crescent shaped polygon would have a center inside the polygon) to its edge. I have parcel data and I am trying to ...
3
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1answer
89 views

R - Programmatically convert raster stack in data frame based on polygon extraction

Sorry for cross-posting. I also posted this question at the R-SIG-GEO discussion list, but since I wanted to get as much feedback as possible I decided to post it here too. I am trying to extract ...
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0answers
24 views

Raster of masked area to polygon shapefile in R

I have masked() two rasters (Landsat scenes), so that I have a new raster that covers the overlapping area of both. Now, I would like to transform the overlapping area into a polygon shapefile. Do ...
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2answers
74 views

How to create a square polygon or buffer with quadrants in ArcGIS?

I have 32 points than I need to create a 2 mile square polygon around, and break each polygon into 4 quadrants. I've tried a few things, including creating an MBR(Minimum Bounding Rectangle) around a ...
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0answers
83 views

How can I get ALL addresses within a polygon, with Google Maps or another free provider? [closed]

I am hoping to find a good solution to doing this. We would like to be able to define a polygon of latitude/longitude values and be able to have a dataset of all of the addresses within that polygon. ...
3
votes
1answer
54 views

Finding Points in Polygons with Matching ID's?

I'm fairly new to using PyQgis, so sorry if this question is basic. I'm working with two vector layers: (layer 1) A series of polygons, each with an ID field specifying what geographic district the ...
0
votes
1answer
84 views

How to create a polygon with a circular hole in openlayers 3?

To highlight an area on my map I need to make a circular hole in a polygon. The rectangle polygon covers the whole map, the circle hole should act as a spot on my area to highlight. But actually I ...
2
votes
1answer
82 views

Cut polygon into equal parts

Is there a way to cut a polyon in equal parts? Basically, I have several rectangles that I need to divide into equal parts, either 3, 4 or 5 equal parts. I am using ArcGIS 10.3.1
2
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0answers
27 views

Create polygon layer from point data with number attribute where polygon encloses n% of point data attribute value in QGIS [closed]

I have two sets of data, one is the CodePoint Open with the location of all of the uk postcodes, the second is from online form data from which I've extracted the postcode and telephone area code, and ...
5
votes
2answers
117 views

Is it possible to clip a shapefile to an image() in R?

I am working on mapping some netcdf data in R and have been having a tough time trying to perform a clip with an imported country shapefile that I'm using. Here is my question from yesterday. If you ...
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0answers
65 views

Creating holes in polygon using Leaflet draw?

I want to load some geojson data into Leaflet draw and allow the user to edit the polygons and also add holes inside polygons.
2
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0answers
67 views

Area Calculations dont agree after raster to polygon conversion

I have a landsat 8 image [UTM 19s] (30m resolution, so 900m sq per pixel). I need to calculate the total area (hectares) from a land cover type. I take the count of pixels from the attribute table, ...
2
votes
2answers
50 views

Semantics of polygon points - How to join the dots?

The question arise from reading the standard "OGC® Sensor Planning Service Interface Standard 2.0 Earth Observation Satellite Tasking Extension", that you can get from ...
2
votes
4answers
159 views

Python Library for converting GeoJSON Multi-polygon to polygon

I would like to know if there is a Python library that can be used to convert GeoJSON Multi-polygon to a Polygon. Note: i want to convert .geojson file Multi-Polygon feature type to Polygon feature ...
1
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1answer
46 views

Lat long co-ordinates in geojson format for Alaska(smaller), bigger Guam and Puerto Rico?

How do I get the geojson format of Alaska, Guam and Puerto Rico in different sizes ? The sizes I have for Alaska is too large and too small for Guam and Puerto Rico. I'm very new to mapping ...
0
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0answers
35 views

Geological map generalization polygon aggregation

I am working on generalization of Geological maps and the first thing I am wondering about is aggregation of separate patches that may have same class and which are closely situated to each other. ...
1
vote
1answer
77 views

Calculating the length of the network lines inside polygon in QGIS 2.10.1

I am working with 2 datasets: delineations of the neighbourhoods traffic network. This is how they look: I would like to calculate the length of the roads per neighbourhood (polygon). As you ...
8
votes
4answers
176 views

How to create a polygon connecting the endpoints of multiple lines using python?

I'm trying to figure out how to create a polygon that connects all the endpoints of a shapefile containing a set of polyilnes with pythonscript in ArcGIS, I'm having trouble doing this as the order of ...
3
votes
0answers
31 views

How do you show agreement between polygons based on hand-drawn maps?

I'm somewhat new to GIS, coming from a linguistic background, and now I'm trying to make QGIS do something that I want from that background. I have some hand drawn maps with certain areas of the ...
6
votes
2answers
272 views

Deleting polygons smaller than certain dimension using ArcGIS for Desktop?

I've made a model in modelbuilder in Arcmap 10.3, what it basically does is creating polygons over open areas such as farm-lands, grass-lands, marshes etc that has a low slope. My challenge is that I ...
5
votes
1answer
135 views

Create shapefile of raster outline using python

I want to create a single bounding shapefile polygon of valid pixels in raster data (GeoTIFF) using python. I need something efficient as I need to do this for hundreds of rasters. I had thought of ...
5
votes
2answers
135 views

Move a layer in QGIS to a precise position based on centroid

I'm not quite sure how to phrase this so apologies if it is a duplicate. I have a project that uses a series of lines created from the boundaries of polygons overlaid onto a map in QGIS. I understand ...
2
votes
1answer
57 views

Converting kriging grid to polygon?

I have an Excel file with coordinates and a measured value belonging to this coordinates. In ArcMap I can display the points and color it concerning the measured values. Since most of the values close ...
2
votes
2answers
59 views

Selection on Overlapping Polygons

I have converted a CAD file to GIS format using GIS (from .dgn to .shp)... In one layer I have polygons in which a smaller one is on top of the larger polygon. I can see both polygons however when I ...
0
votes
1answer
51 views

Multply polygon with raster

I have a countries' polygon with an attribute table. I also have a raster. I want to multiply the values of the polygon (of each country) with the raster. Polygon Countries Cost C1 X ...
6
votes
1answer
77 views

How to make a wedge shapefile in R?

I'm quite okay at R programming, but fairly new in GIS (especially in R). I have a set of coordinates and I'd like to create a custom shape around them. What I want to do step-by-step: Create a ...