shapefile | A cross-platform streaming parser for the ESRI Shapefile spatial data format
kandi X-RAY | shapefile Summary
kandi X-RAY | shapefile Summary
For a live example, see bl.ocks.org/2dd741099154a4da55a7db31fd96a892. See also ndjson-cli for examples of manipulating GeoJSON using newline-delimited JSON streams. See Command-Line Cartography for a longer introduction.
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Top functions reviewed by kandi - BETA
- Opens a single file .
- Opens a file .
- Represents a Dbf .
- Check if a point is contained in a ring
- Opens a specified shp resource .
- Checks if a ring is contained in a ring .
- Represents a shapep .
- Determines whether a line segment contains a point .
- Reads the next chunk .
- Read a chunk .
shapefile Key Features
shapefile Examples and Code Snippets
Lines of Code : 15License : Permissive (MIT License)
Copyprivate static File getNewShapeFile() {
String filePath = new File(".").getAbsolutePath() + FILE_NAME;
JFileDataStoreChooser chooser = new JFileDataStoreChooser("shp");
chooser.setDialogTitle("Save shapefile");
choose Community Discussions
Trending Discussions on shapefile
QUESTION
I have a raster data and wants to make contour graph similar to the this question enter link description here. I got the code from here. But I want to highlight (colour) the regions which is above 75 percentile and remaining by the simple lines that are shown in picture below. I copied the code from the the above link
Code is folowing
...ANSWER
Answered 2022-Apr-09 at 16:05You can set the breaks of geom_contour_filled to start at your 75th centile, and make the NA value of scale_fill_manual transparent. You also need to draw in the default contour lines:
QUESTION
I have a problem with drawing the legends in a ggplot. I have already searched the net for hours for a solution but have not found anything yet.
I am trying to create a ggplot with different line and polygon shapefiles. I draw the shapefiles with the function geom_sf(). The drawing is not a problem. My problem is related to the legend creation.
The goal is to create a plot that has a single legend and has all the different shapefile types including their colors and or fill astetic. That means, a line-shape should be represented in the legend as a simple line and a polygon-shape as a simple polygon. I have managed to do all that.
The main difficulty is that one of the polygonshape (for better readability) not only uses the "fill" argument as astetic but also the "color" argument.
If I create a plot where all polygonshapes always use the fill argument as astetic and all lineshapes always use the color argument as astetic everything works fine. But as soon as I include a polygonshape in the plot which uses both arguments at the same time, it destroys the whole legend structure. In this case, for example, the symbols for the line shapefiles suddenly have a frame and/or background although they should not have one.
Is it not possible to build something like this with ggplot or am I just being clumsy?
Summary:
Analogous to the minimal example created below, I would like to create a single legend in this plot where:
- A = a polygon symbol is without border (as it can be seen in the
plot) - B = a polygon symbol is with border (as seen in the plot) and
- C = a simple line without border or background (as it can be seen in the plot).
How do I get this to work?
...ANSWER
Answered 2022-Feb-25 at 21:32You can do this with ggnewscale and setting the key glyph for each geom layer:
QUESTION
There are some other posts out there related to this one, such as these: Post 1, Post 2, Post 3. However, none of them deliver what I am hoping for. What I want is to be able to draw a line segment from a specific point (a sampling location) to the edge of a polygon fully surrounding that point (a lake border) in a specific direction ("due south" aka downward). I then want to measure the length of that line segment in between the sampling point and the polygon edge (really, it's only the distance I want, so if we can get the distance without drawing the line segment, so much the better!). Unfortunately, it doesn't seem like functionality to do this already exists within the sf package: See closed issue here.
I suspect, though, that this is possible through a modification of the solution offered here: See copy-pasted code below, modified by me. However, I am pretty lousy with the tools in sf--I got as far as making line segments that just go from the points themselves to the southern extent of the polygon, intersecting the polygon at some point:
ANSWER
Answered 2022-Feb-24 at 08:35Consider this approach, loosely inspired by my earlier post about lines from points
To make it more reproducible I am using the well known & much loved North Carolina shapefile that ships with {sf} and a data frame of three semi-random NC cities.
What the code does is:
- iterates via for cycle over the dataframe of cities
- creates a line starting in each city ("observation") and ending on South Pole
- intersects the line with dissolved North Carolina
- blasts the intersection to individual linestrings
- selects the linestring that passes within 1 meter of origin
- calculates the lenght via
sf::st_lenghth() - saves the the result as a {sf} data frame called
res(short for result :)
I have included the actual line in the final object to make the result more clear, but you can choose to omit it.
QUESTION
I am working on submitting an R package to CRAN. Right now I am trying to reduce the memory footprint of the package. Because this package deals with spatial data that has a very particular format, I want to include a properly formatted shapefile as an example. If I include the full-size original shapefile, there are no warnings (other than file size) in the R CMD checks. However, if I crop the file and include the cropped version in the package (in "inst/extdata") I get this warning:
...ANSWER
Answered 2022-Feb-11 at 23:59This is a known issue[1] where file will mis-identify DBF files with last-update date in the year 2022. Easiest fix is to not use a 2022 update date when saving the file. Alternatively you can simply change the second byte of the file after the fact, e.g.:
QUESTION
I am trying to use pysftp's getfo() to read a shapefile (without downloading it). However the output I get does not seem workable and I'm not sure if its possible do this with a shapefile.
Ideally I would like to read in the file and convert it to a Geopandas GeoDataFrame.
...ANSWER
Answered 2021-Dec-28 at 07:45Something like this should do:
QUESTION
Is it possible to import a .tpk map file either in R or QGIS and use it as a shapefile? I need the coordinates of specific locations in the .tpk map that could be extracted with a shapefile map. I do not have access to ArcGIS.
Grateful for any guidance!
For additional information about .tpk, please see: https://pro.arcgis.com/en/pro-app/latest/help/sharing/overview/tile-package.htm
...ANSWER
Answered 2021-Nov-26 at 23:25Here's what I've done:
First convert the tpk file to mbtiles using the tpk conversion utility from https://github.com/consbio/tpkutils
QUESTION
I'm using this dataset: https://sedac.ciesin.columbia.edu/data/set/gpw-v4-population-density-rev11/data-download (Gridded population density of the world)
With this map: https://data.humdata.org/dataset/uganda-administrative-boundaries-as-of-17-08-2018 (Uganda administrative boundaries shapefile)
I have clipped the uganda map to the region I need, like so:
...ANSWER
Answered 2021-Nov-18 at 22:19The problem is the shapefile is in UTM coordinates and the raster is a world coordinate system (lat/long). Even though you assign the epsg:4326 crs to gdf it's coordinates are still in UTM. You can convert these manually doing something like this.
Otherwise, you can re-projected the world raster into EPSG:21096 (estimation based off UTM zone from the uganda shapefile) using QGIS or you can use gdalwarp.
After changing the projection on the raster the rest of your code worked.
QUESTION
I am trying to extract countries from NetCDF3 data using the pdsi monthly mean calibrate data from: https://psl.noaa.gov/data/gridded/data.pdsi.html. I am using the following code which performs a spatial merge of coordinates and identifies countries based on a shapefile of the world.
...ANSWER
Answered 2021-Nov-16 at 19:06- have sourced data that you referenced to ensure this can be re-run on any machine
- core solution, a square buffer around the point https://gis.stackexchange.com/questions/314949/creating-square-buffers-around-points-using-shapely
- have analysed data to ensure value used for buffer is appropriate and calculated from data
QUESTION
In previous versions of the spsurvey package, it was possible to draw random points within polygons in a shapefile using a somewhat complicated design specification. (See here for an example).
The newly updated version of spsurvey (5.0.1) appears very user-friendly, except I cannot figure out how to perform a GRTS draw of more than one point within polygons. Below is an example:
Suppose I want to draw 10 random points using GRTS within the states of Montana and Wyoming. The grts() call requires an sf object, so we can get an sf object first.
ANSWER
Answered 2021-Nov-16 at 16:21This is a bug. I have updated the development version, which can be installed (after installing the remotes package) by running
QUESTION
I have a shapefile with 7 regions. I have an excel file with data about reptiles in these 7 regions. I merged this shapefile with excel.
Using ggplot I tried to generate facet_wrap() from nome_popular, however the rest of the polygon parts were omitted in each facet created.
My tentative code
shapefile: https://drive.google.com/file/d/1I1m9lBX69zjsdGBg2zfpii5H4VFYE1_0/view?usp=sharing
...ANSWER
Answered 2021-Oct-31 at 05:58The issue is that with faceting the data is splitted in groups and only the polygons contained in the splitted data will show up.
If you want all regions to be shown in each facet then one option would be to add a base map via second geom_sf layer. In your case + geom_sf(regiao) + geom_sf() should do the job.
As an example I make use of the default example from ?geom_sf:
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