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
221 views

How to create custom discrete color scheme for polygon attributes in ggplot2?

Back again with more questions. :) Data: Zipped ea.ml1 shapefile can be found here, and the country outline can be downloaded here at the GADM site. I've been using the Ethiopia ESRI shapefile. As ...
2
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2answers
84 views

How to calculate the intersection within the grid and saving to the grid

Here is my example: (1) I creat the grid line layer using MMQGIS plugin (2) I use line intersection function to get the intersection points. I want to calculate the distance sum within each ...
0
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1answer
39 views

Polygon Representation from Contours

I have contours lines along with their elevations in ArcGIS. I want to create a polygon representation from those contour lines. How can i create polygons from those contours which may help me to ...
0
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2answers
85 views

How to create circles starting with points and attributes (diameter, lat/long)?

I have a point shapefile with attributes (diameter, latitude and longitude). For each point in that file, I want to create a polygon (circle) described by those attributes. The new shapefile should ...
3
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2answers
124 views

Move leaflet polygon to given position

I have a circle and a polygon that I'd like to move to the user's local position. I managed to move the circle latLng but I can't find a way to do the same thing with a polygon. Can someone help me ...
3
votes
1answer
128 views

How to reshape polygons with curves in ArcMap?

I'm looking for a good method for reshaping parcel polygons that have curves. One side of a given polygon (like in my screenshot) has a curve but for some reason, the other side was made with straight ...
1
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2answers
71 views

Labeling each side of polygon with its length in ArcGIS Pro?

I am trying to figure out a way in ArcGIS Pro to label each side of a polygon with the length of the side without breaking it into individual polylines.
3
votes
1answer
53 views

Positioning labels in center of clipped polygons?

I am using ArcMap 10.1 and would like to label a polygon layer that i have clipped. It appears that the label is set for the geometric center of the polygon that falls outside of the clipping.
1
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1answer
45 views

Converting Multiple Polylines to Polygons

I have a shapefile for Parcels but the whole thing seems to be divided into polylines rather than polygons. I'm trying to create an existing land use map. I was hoping there is an easier way to ...
4
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2answers
96 views

Manually selecting colors for different polygons within layer in ArcMap?

There is a polygon layer with several polygons. They are displayed with some colour which can be changed simultaneously for all of them. Is there a way to manually select several polygons (without ...
4
votes
2answers
71 views

Get the 2 points immediately before and after a given point in PostGIS

In the picture below: The given point is C, I would like to select A and B, but not Z (which is closer to C than B but it's not immediately after in the LineString). Note that C is always ON the line ...
3
votes
1answer
41 views

Iterate polygon column in ArcGIS model builder

I have a polygon with many columns. I want to convert into raster. I could do it one by one. But I want to iterate for each column of the polygon by model builder or any other way. Here you can see ...
2
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1answer
49 views

Error while executing v.rast.stats command in grass plugin in qgis

I have a vector polygon which I imported in grass. I also have a raster from which I have to extract the value. I ran v.rast.stats command in QGIS 2.12. The command was executed with error. The error ...
1
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1answer
32 views

“polygon” on sphere postgis geography

I have a set of points defined by their longitude and latitude, and I would like to check if they lie within a "polygon" on sphere. By polygon on sphere, I mean area in between 4 lines going between 4 ...
4
votes
1answer
52 views

PostGIS point distance from polygon not 0 when on edge

I have a pretty simple problem: SELECT * FROM ST_Distance(ST_GeographyFromText('POLYGON((70 -40,70 -39,71 -39,71 -40,70 -40))'), ST_GeographyFromText('POINT(70.48 -39)'), False) returns ...
3
votes
3answers
137 views

How can I join two polygons that are within the same layer in QGIS?

I have two polygons in QGIS that are within the same layer and I want to merge them so they are not in two different polygons, which means that the gap between them sould not exist. How do I do that? ...
0
votes
1answer
479 views

OpenLayers 3 draw polygon to select features

I have a set of points on a vector layer and I am allowing the user to draw a polygon on another layer of the map. I want to select all the points inside the polygon. I have got this to work, but ...
4
votes
1answer
123 views

Clipping raster file in ArcMap over the extent of polyline shape

I have a calculated raster file, overlayed on a shapefile with lines (like on figure) I would like to clip the raster in ArcMap (since it is an interpolation and out of the vector shape it is mostly ...
1
vote
1answer
69 views

QGIS Polygon edge style based on adjoining feature?

Is there a way to change the style of only PART of a polygon's border in QGIS? I would like one or two edges of certain polygons to render a different color, or not at all, depending on the type of ...
0
votes
1answer
173 views

Build a leaflet polygon(s) from GeoJSON feature(collection)

I find it quite practical to work with leaflet Polygon and it would be great to be able to build such objects directly from GeoJSON content. I did not find any Polygon constructor taking neither a ...
0
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2answers
47 views

Polygon Torque Map- problem changing polygons to points

I'm trying to alter my data on cartodb map to get maritime emissions over about 20 years- by country. Hence trying get a torque map for polygons, and by changing polygons to points based on a ...
7
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2answers
437 views

Displaying legend item as polyline instead of polygon in ArcMap?

I am using ArcMap 10.1 and am trying to create a legend that will display a polygon layer as a single line.
5
votes
3answers
108 views

Dissolve overlapping polygons in SAGA

I've got the following (2D!) situation of overlapping polygons: I would like to have the polygon border dissolved such that I have only one polygon left. I thought this was a definitive case for ...
0
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0answers
26 views

Geometry Location In Respect To Another Geometry

I am trying to figure out where a geometry is residing in respect to another geometry. My Image explains things better, I have Square nodes A, and B. and I have circle Child nodes X, and Y. I have all ...
2
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0answers
36 views

“Point in polygon” counts that respond to filters?

I have a list of addresses in one layer and a polygon layer of census block groups for the local town, all stored in postgis. I have a nice display right now that labels each polygon with a count of ...
3
votes
1answer
53 views

How do I retain all attribute data when clipping two polygons in R? [duplicate]

I would first like to say that my question is very much similar to this answered one, but the proposed solutions don't seem to be working for me. I think that my question is slightly different, as I'm ...
4
votes
1answer
88 views

How to get the list of QgsPoint from a polygon Layer in pyqgis

I have a little question about how to manage the points in a layer. from qgis.core import * def run_script(iface): layer = QgsVectorLayer(layerType.Polygon+'?'+crs.psg_4326, ...
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0answers
48 views

create polygons using 2 coordinates

I have a script that creates a text file containing the upper left and lower right coordinates of my geotiff files in the following format. TileName UpperLeftX UpperLeftY LowerLeftx LowerLeftY I ...
0
votes
1answer
51 views

Reshaping automatic polygon edge based on reference layer using ArcGIS for Desktop?

i have two polygon layer, one for Region administrative"Reference layer", and the second is administrative border is governorates. Governorates border is not identical with Region border. So there is ...
1
vote
1answer
68 views

Average of raster elevation based on polygon boundaries

I am attempting to extract and calculate the average height of buildings using LiDAR converted to raster elevation data. I've created a DSM to cover the entire area and I am trying to extract just the ...
0
votes
2answers
71 views

Count the number of raster tiles in each polygon in ArcGIS

I have a raster from the TRMM 3B43 product that contains a grid of 0.25 x 0.25 tiles (in degrees). I also have a shapefile with a number of districts. I want to know how many raster tiles are included ...
1
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1answer
110 views

Finding the area of polygons within other polygons in R

Is there a function in R which will loop through a layer of zonal polygons (i.e. a polygon grid) and return the area of a second polygon layer that is contained in each grid cell? I have a layer of ...
1
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1answer
153 views

Creating building footprints from LAS files

I wish to create building footprints from the classification in our LAS files. I have filtered out the building points, using the point cloud filter. But I now trying to join the outermost points of ...
2
votes
1answer
140 views

Cutting Polygon in Two in ArcMap?

For ArcMap10: I know there are multiple way to do this, but I wanted to see what was the most efficient for this case, as I will be doing it repeatedly in my workflow. I have a .shp polygon layer with ...
0
votes
1answer
38 views

Polygon shapefile layer shows NoData for Identify in ArcGIS Desktop?

I have a soil survey polygon map with each polygon representing a soil type. If I examine the attribute table of the layer, I can see what each polygon represents. If I select a row in the ...
1
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0answers
11 views

How to calculate area percentage from polygons from one shapefile within another? [duplicate]

I'm working on a project where I have to create python code that takes land-use data and adds a percentage field for each land-use category in a Census Tract shapefile. I've been trying to work with ...
0
votes
1answer
203 views

Spatial Join in R

I'm fairly new to using R for spatial work so bear with me. I have found questions similar to this but nothing that answers this question specifically enough for me to implement it. I have point data ...
2
votes
1answer
74 views

Polygon split with defined area

I have polygons with interpolated data like on the picture on right. Now I want to split this polygon into smaller polygons with predefined similar area. Positions of these smaller polygons must be ...
3
votes
1answer
211 views

How to create a Color Ramp for Polygon Outlines in ArcGIS-Desktop?

Within the properties (symbology tab) of ArcGIS-Desktop (10.2.2, ArcEditor license level), is there a way to color the polygon outline of a layer using a color ramp? Using predefined color ramps ...
1
vote
1answer
254 views

Split a polygons into many polygons based on points using ArcMap

I have: A polygon feature that is a national park boundary, A multi-point feature that are security guard posts (number = n ) of the same park. I want to divide the national park area into 'n' ...
0
votes
1answer
95 views

Match polylines up to polygon

I'm trying to match polyline layer features up to polygon edges in a different layer quickly. I have a huge extent of polygons (river) and separate lines (bank features) that I need to get to ...
4
votes
1answer
82 views

Weighting amount of overlapping polygons in postgis

I have two tables that I join in my existing workflow. One of these includes flood events (was a shapefile that has been imported to PostgreSQL), the other one is a grid that holds the amount of ...
2
votes
2answers
118 views

Average width of irregular polygons QGIS 2.12.0 Lyon

I'm interested in examining the average width of streets, that are irregular polygons, for a project. I'm using QGIS 2.12.0 Lyon, and have lines (power cables) and Polygons (streets) as layers. For ...
1
vote
1answer
35 views

Create Polygon with 50'000 vertices

Is there a way to automatically create a new polygon in an existing Feature Class with over 50'000 Vertices? I work with ArcGIS 10.2 and FME. Hints how to create such a polygon within ArcGIS Desktop ...
3
votes
2answers
66 views

Splitting up selected islands using ArcGIS for Desktop?

What I'm trying to do is to split up that selected islands as single-part features/ polygons. But not all of them, you can see some little dots around the islands are like a part of the island. So ...
2
votes
2answers
85 views

Close Slivers in Polygon

I am creating polygons from a text file and am having trouble with the polygons crossing the 180 degree line. The issue is creating rectangular polygons with a sliver cut out of it as seen here: I ...
0
votes
1answer
93 views

How can I draw a polygon with a fixed area in ArcMap

Is there a way to draw a polygon with a fixed area in ArcMap? For example, I'm trying to create a 40,000 foot boundary around a feature, but the boundary does not have to be any specific length or ...
1
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0answers
32 views

Point and Polygon Data refusing to display: corrupt data?

I have two sets of shapefiles, one point data and one polygon data. Both were sent as part of a bigger set of data. Neither the point or polygon data will display when loaded into QGIS. The raw data ...
2
votes
0answers
37 views

How can I measure the distance between many polygon features and either another polygon or a line in QGIS?

I often have to manually measure the distance between a single site and other sites around it, but obviously this can get long-winded and I feel like there must be a much more efficient way of doing ...
2
votes
0answers
28 views

Tool to help us re-district?

I work for a mid-sized school district and we unfortunately have to close one of our school buildings. That means that the neighborhoods who've been sending their children to the school that is ...