geospatial

问题 I know that room is an abstraction layer over SQLite, I just want to know if I can use it for a different type of Database. I want to use Room to a special version of SQLite with geospatial support, is it possible? I really can't find an answer about this one. Android Spatialite Thanks in advance! 回答1: Yes, if you are willing to write the bridge code for it. One of the methods that you can call on a RoomDatabase.Builder is openHelperFactory(). This takes an instance of SupportSQLiteOpenHelper

问题 I am trying this from hours now and I couldn't get get it solved. I am using this link to setup GeoDjango on Windows. I am getting following error message and I have no clue what to do. All the environment variables are set in Windows and I am able to import with from osgeo import gdal successfully in python terminal as import gdal is deprecated. In Postgresql database I have all extensions available as required like address_standardizer , fuzzystrmatch , ogr_fdw , pgrouting , plpgsql ,

问题 I am trying this from hours now and I couldn't get get it solved. I am using this link to setup GeoDjango on Windows. I am getting following error message and I have no clue what to do. All the environment variables are set in Windows and I am able to import with from osgeo import gdal successfully in python terminal as import gdal is deprecated. In Postgresql database I have all extensions available as required like address_standardizer , fuzzystrmatch , ogr_fdw , pgrouting , plpgsql ,

问题 i´m using this example to load Radolan Data in R Example, RADOLAN Specification binary_filepath <- paste0("raa01-rw_10000-1708091950-dwd---bin") header_end <- regexpr("\003", readLines(binary_filepath, 1)) rb_stream <- file(binary_filepath, "rb") skip_temp <- readBin(rb_stream, "raw", n = header_end, endian = "little") rb_data <- readBin(rb_stream, "raw", size = 1, n = 900*900*2, endian = "big") rb_data <- rawToBits(rb_data) rbi <- lapply(seq(0, 900*900-1, 1), function(x){ sum(as.integer(rb

问题 i´m using this example to load Radolan Data in R Example, RADOLAN Specification binary_filepath <- paste0("raa01-rw_10000-1708091950-dwd---bin") header_end <- regexpr("\003", readLines(binary_filepath, 1)) rb_stream <- file(binary_filepath, "rb") skip_temp <- readBin(rb_stream, "raw", n = header_end, endian = "little") rb_data <- readBin(rb_stream, "raw", size = 1, n = 900*900*2, endian = "big") rb_data <- rawToBits(rb_data) rbi <- lapply(seq(0, 900*900-1, 1), function(x){ sum(as.integer(rb

问题 I use to plot maps of Belgium available on GADM (select Belgium) using R. I import and plot the outside boundary of Belgium using : belgium <-readRDS("gadm36_BEL_0_sp.rds") plot(belgium) Which gives me : I import and plot the boundaries of provinces of Belgium using : provinces <-readRDS("gadm36_BEL_2_sp.rds") plot(provinces) Which gives me : What i'm trying to have is a dataframe with boundaries of provinces that are NOT outside boundaries of Belgium : I tried using over() , intersect() ,

问题 I use to plot maps of Belgium available on GADM (select Belgium) using R. I import and plot the outside boundary of Belgium using : belgium <-readRDS("gadm36_BEL_0_sp.rds") plot(belgium) Which gives me : I import and plot the boundaries of provinces of Belgium using : provinces <-readRDS("gadm36_BEL_2_sp.rds") plot(provinces) Which gives me : What i'm trying to have is a dataframe with boundaries of provinces that are NOT outside boundaries of Belgium : I tried using over() , intersect() ,

问题 I have linestring which represent a driving journey down some streets. But I want to actually represent a cyclists journey, which is offset from the line i.e. they travel near the kerb of the road. I'm struggling with how to do it. I've made a reproducible piece of R code to illustrate. ## Let's say I have a route along some streets. library(ggplot2) ## It can be described by this data <- data.frame(x = c(1,3,10,5,0,5), y = c(1,3,1,0,5,7), label = c('a', 'b', 'c', 'd', 'e', 'f')) ##

问题 right now I have a little problem: I want to use geospatial commands (like getIntersecting) together with the changefeed feature of rethinkdb but I always get: RqlRuntimeError: Cannot call changes on an eager stream in: r.db("Test").table("Message").getIntersecting(r.circle([-117.220406,32.719464], 10, {unit: 'mi'}), {index: 'loc'})).changes() the big question is: Can I use getIntersecting with the changes() (couldn't find anything related to that in the docs btw ...) or do I have to abandon

问题 This question already has answers here : Calculate distance between two latitude-longitude points? (Haversine formula) (44 answers) Closed 7 years ago . I am trying to determine if two locations (each with their own latitude and longitude values) are within a certain distance of each other, a 3 mile radius for example. I have double values to represent the latitude and longitude of each location. //Location 1 Double lattitude1 = 40.7143528; Double longitude1 = -74.0059731; //Location 2 Double