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Questions tagged [polygon]

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.

http://en.wikipedia.org/wiki/Polygon

4484 questions
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Reducing Polygons

I am merging several data sources into one final answer via a fishnet. My problem is I have landcoverage with multiple attributes unioned to a fishnet. Now I want to eliminate the smaller polygons so only the attributes of the majority polygon…
user9297
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Create perimeter from given area

I need to develop a web-based application to manage areas inside a bigger area. I already have the initial perimeter, and it has irregular borders like that: . I will need to tell the app to create a perimeter based only in a given area.…
gcstr
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Polygon artifacts on zoom

Since several QGIS updates ago, I have been having a horribly annoying issue of polygon parts appearing where they shouldn't when I zoom in. It doesn't seem to matter whether it is a .kmz file or a shape file. I am not a programmer type... The…
Susan Kagel
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Plotting of non-spatial data with the same geometry

In order to create my tmap, I merged my spatial data (which includes State ZIP Codes, Cities and ZIP Codes Polygon Geometry) with my non-spatial data (Individual Personal Info, Individual's ZIP Code, and other variables). In total I have 1500…
Montserrat Marroquín
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How to auto Correct Polygons that are not drawn correctly?

I was part of a project recently where handheld GPSs were used to collect vertices of parcels. After plotting the points using 'P2One' plugin in QGIS I found out that some of the polygons were twisted due to the fact that the vertex points were not…
Kay
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Google Map Area of Interest exported to Polygons

Is there a way to export the yellow shaded areas of interest in Google Maps as polygons. I am only interested in England and primarily only really interested in High Streets Towns & Cities, i.e. retail areas. I have looked everywhere for alternative…
Bob
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Polygon Translated by Using ST_TRANSLATE Changes Size

My goal here is to take a polygonal area defined in latitude-longitude coordinates (SRID=4326) and translate it to another place on the globe while preserving size and shape. I had thought to use ST_Translate for this as follows: SELECT…
teddybouch
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When adding one polygon over another polygon the last added polygon is going behind existing polygon

I'm drawing a geological map so I've several polygons in a single layer as geological units. After finishing the map I need to add a few new geological units (means new polygons), but they are all overlapping one or more existing polygons. If I…
Sedat
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How to get specific area boundaries on a map?

I want to get specific area boundaries highlighted on the map or by coordinates. I tried to search on google maps with this structure (district, city, country), sometimes it works and give me the area boundaries like this : and sometimes it shows…
Rowayda Khayri
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Finding values within intersecting polygons?

I have 2 shapefiles; one has income data on a block group level, the other has polygons showing utility providers service areas. I would like to know the income within each utility provider area. Many of the utility service provider area polygons…
user86394
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Clipping algorithm that can make one layer with no overlapping polygons from N polygons

I am looking for an algorithm description / pseudo code for an algorithm that can take N simple polygons and return a new set of polygons that all have been clipped such that there is no overlap in the set of polygons. Each input polygon will have a…
Poul K. Sørensen
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How illustrate cells in attribute table?

I have an attribute table with 2883 rows which are the OA of Leicestershire with their Easting and Northing column. I have four more columns in the attribute table (four land use classes) that carry the population density of each land use class in…
Zeinab
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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 C2 Y C3 Z I also have a…
dimitris
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How do I calculate the distance of a segment of line that is inside a polygon?

I would like to calculate the distance of a portion of a line that is inside a polygon, as well as the portion that is outside of the polygon, based on from/to lat/long points on the line, and the lat/long points that define the polygon…
Andrew Odri
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Why is polygon used as range in GIS and maps?

I am enroute to create an app that finds nearest venues. I already have another SO question on this regard. I don't have any experience with such features, and some of the concepts are not being very obvious to me. So, I have been thinking that I am…
Kishor Kundan
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