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Questions tagged [spatial-data]

46 questions
39
votes
3 answers

Can I use Entity Framework 6 (not core) in .net core?

Entity Framework Core does not support spatial data, which I need to use in my app. Can I use Entity Framework 6 in .net core? If so, how can I register DatabaseContext in Startup.cs?
kostik
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6
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1 answer

Intersection of polygons in R using sf

I want to assess the degree of spatial proximity of each point to other equivalent points by looking at the number of others within 400m (5 minute walk). I have some points on a map. I can draw a simple 400 m buffer around them. I want to…
damo
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4
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2 answers

What is the difference between STAsText() and ToString() in sql while converting geography to wkt

DECLARE @geographyData geography; //Convert wkt to geography SET @geographyData = geography::Parse('LINESTRING(-132.360 50.657, -120.340 47.659)'); //Convert back to wkt from geography (1) @geographyData.ToString(); (2)…
Milan
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3
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1 answer

Euclidean Distance for Arrays of 3D points in Python

I have two .csv files of 3D points (numeric coordinate data) and associated attribute data (strings + numeric). I need to calculate the Euclidean distance between each point and every other point, and maintain the attribute data for each point…
COIh0rp
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3
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1 answer

Calculating number of pixel(count) raster files in R

I have a huge number of raster files and a polygon that is within the extent of the raster files. I want get the pixel number(count) for each raster files within the polygon. Additionally I want to create a table with the name of raster file and…
equastrian91
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2
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0 answers

How to overcome infinite value to perform multicollinearity test in environmental variables?

Here's the dataset which consists of X = 45 columns collected the data from bioclimate database. The multicollinearity test model - from statsmodels.stats.outliers_influence import variance_inflation_factor vif_data =…
perth
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2
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1 answer

How to label only one point in tmap in r?

In the example below I would like to have only the label for Ghana in the tm_text("name") layer showing. Any idea how to do this? Thank you for your help. library(tmap) data("World") tmap_mode("view") tm_shape(World) + tm_polygons("HPI",…
Ama Owusu-Darko
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2
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3 answers

What is initial bearing and final bearing

I am trying to calculate bearing between two lat/lon points as given in this link. I see that the bearing we get initially using the below equation is initial bearing. public static double GetBearing(double latitude1, double longitude1, double…
Sree
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2
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2 answers

I can not publish a workbook contains spatial data on TABLEAU SERVER

I created a map using Tableau Desktop 2018.2.4, that works works well in the Desktop version of Tableau. However, when I try to publish the workbook to Tableau Server 10.2.3, I receive an error saying that the spatial data does not exist in my…
lyly
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2
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1 answer

smooth (Lon, Lat, Value) data over shapefile

I am trying to plot a data with (Lat, Lon) and a value in each location. What I need to do is to plot the data over a shapefile, represent each value with a different color, and smooth the values, so no gaps occur in the map. The data has the…
Moe_D
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2
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2 answers

unable to plot two spatial objects with identical CRS in R

I have two spatial objects, one is a spatial polygon object and the other one is a .csv file that I turned into a spatial points object. The first one is an official shape file from the chilean government for one of its communes, the other one was…
csmontt
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2
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1 answer

Need to move SQL Server 2005 Table storing Lat;Lng as varchar to Spatial?

I have read some articles about using spatial optimized tables. Actually I use stored latitude and longitude as varchar comma-separated (lat;lng). Could you suggest the best way to perform this change and enumerate the advantages. It's really…
user325558
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2
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1 answer

locality sensitive hashing for spatial data

I would like to find out a Locality Sensitive Hashing algorithm in order to split my spatial data into a number of buckets(reducer tasks). The spatial data are actually trajectories so from my understating of LSH a trajectory will be represented a…
Adam
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2
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3 answers

Managing large spatial data set with attributes in C++

I have a data set with about 700 000 entries, and each entry is a set of 3D coordinates with attributes such as name, timestamp, ID, and so on. Right now I'm just reading the coordinates and render them as points in OpenGL. However I want to…
ael
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2
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0 answers

calculate mean for each cell in grid in R

Possible Duplicate: Sliding window function in R This might be a silly question, but I couldn't find an answer so far. I have a data frame like this: df <- data.frame(lat = (-10: 10), lon = (-10: 10), A =…
matteo
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