geospatial

问题 I want to fetch a table named supplier_products which has following columns ID Item_id supplier_id variant_id price lat lng serving_radius(in km) 1 1 2 12 22.00 26.11360000 85.39430000 1 2 1 3 12 44.00 26.11360000 85.39430000 4 3 1 2 13 25.00 26.11360000 85.39430000 4 4 1 3 13 23.00 26.11360000 85.39430000 4 Now for searching supplier products near a latitude and longitude say ($lat = 26.1136;$long = 85.3643;) . i was using this query SELECT *, (6371 * acos(cos(radians('$lat')) * cos(radians

问题 This question already has answers here : Link each point in one GeoPandas dataframe to polygons in another dataframe (2 answers) Closed 19 days ago . I have a shapefile of London with over 4000 unique polygons representing lsoa areas. I have also created a geodataframe of points representing sensors in the city. I need to work out which lsoa area (ie which polygon) each sensor belongs to/is within. So ideally I would have a list of each sesnsor_id_location and their respective lsoa number

问题 This question already has answers here : Link each point in one GeoPandas dataframe to polygons in another dataframe (2 answers) Closed 19 days ago . I have a shapefile of London with over 4000 unique polygons representing lsoa areas. I have also created a geodataframe of points representing sensors in the city. I need to work out which lsoa area (ie which polygon) each sensor belongs to/is within. So ideally I would have a list of each sesnsor_id_location and their respective lsoa number

问题 This question already has answers here : Link each point in one GeoPandas dataframe to polygons in another dataframe (2 answers) Closed 19 days ago . I have a shapefile of London with over 4000 unique polygons representing lsoa areas. I have also created a geodataframe of points representing sensors in the city. I need to work out which lsoa area (ie which polygon) each sensor belongs to/is within. So ideally I would have a list of each sesnsor_id_location and their respective lsoa number

问题 I am currently working in R and I am using leaflet package to vizualize geospatial data, I would like to make an analysis over the time and display my map given a time slider In R there is the aesthetics function where it's possible to add slider with the frame option, is there a similar function with leaflet/ggmap or at least is it possible to facet the map given different year. I try to do the exercise with ggmap and ggplotly but this doesn't work as expected. Any exemple/ document or hint

问题 I am currently working in R and I am using leaflet package to vizualize geospatial data, I would like to make an analysis over the time and display my map given a time slider In R there is the aesthetics function where it's possible to add slider with the frame option, is there a similar function with leaflet/ggmap or at least is it possible to facet the map given different year. I try to do the exercise with ggmap and ggplotly but this doesn't work as expected. Any exemple/ document or hint

问题 I have a table called IK_TEMP and it contains columns called data, range . String sql = "SELECT DATA, RANGE FROM IK_TEMP"; try (Connection conn = this.connect(); Statement stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery(sql)){ // loop through the result set while (rs.next()) { System.out.println(rs.getString("DATA") + "\t" + rs.getBytes("RANGE")); fromBytes(rs.getBytes("RANGE")); } The RANGE field(binary / BLOB) field is already encoded using binary from arcGIS and saved in

问题 I am doing a project which having some functions on Geographical distance calculation. So I use geographical datatypes in entity framework by adding nuget package SqlServerSpatial110.dll for that function. I think my code is correct. Everything is working on local server. But when I uploaded it to server it shows the error below: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.DllNotFoundException: Unable to load DLL

问题 I am doing a project which having some functions on Geographical distance calculation. So I use geographical datatypes in entity framework by adding nuget package SqlServerSpatial110.dll for that function. I think my code is correct. Everything is working on local server. But when I uploaded it to server it shows the error below: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.DllNotFoundException: Unable to load DLL

问题 I have a set of coordinates: d1 <- data_frame( title = c("base1", "base2", "base3", "base4"), lat = c(57.3, 58.8, 47.2, 57.8, 65.4, 56.7, 53.3), long = c(0.4, 3.4, 3.5, 1.2, 1.5, 2.6, 2.7)) I would like to know whether the coordinates fall on land, in the sea, or are 3 miles inside a coastline. The coordinates should fall somewhere within the UK, so I know that I need to draw a shape file of the UK and plot the points onto it. I just don't know how to measure whether the points fall in the