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What is better way represent a spatial data


What is better way represent a spatial data

By : Serge Kachanov
Date : November 20 2020, 01:01 AM
Hope that helps I'm assuming your grids are all exactly the same size, and are arranged in a perfect rectangle, as indicated by your image. How about storing all grids in a simple 2D array? You can then find the index of any grid by doing
code :
grid_size = 30; 
index_x = math.floor(user.x/grid_size); 
index_y = math.floor(user.y/grid_size);


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The Spatial Data for layer... in the map... is not valid. Specify Spatial data that is data type SqlGeometry or SqlGeogr

The Spatial Data for layer... in the map... is not valid. Specify Spatial data that is data type SqlGeometry or SqlGeogr


By : Kevin Riemens
Date : March 29 2020, 07:55 AM
I hope this helps you . I just solved it, the baseline report I was using didn't include all coordinates in my database, so when I tried to run a report that had a larger scope than my baseline, the VectorData didn't exist for some of the coordinates.
Creating counties spatial dataframe produces columns with NAs where data should have been, unlike the states spatial dat

Creating counties spatial dataframe produces columns with NAs where data should have been, unlike the states spatial dat


By : user2480100
Date : March 29 2020, 07:55 AM
I wish this helpful for you In general it is not a good idea to merge data using names. In your case the county names are completely different in this two data frames. See head(counties$county_name) and head(counties_sf$NAME).
To avoid the use of the names you can use the FIPS code in this case.
code :
library(noncensus)
library(sf)
library(tigris)

data(counties)
counties <- counties %>%
  mutate(GEOID = paste0(state_fips, county_fips))

counties_sf <- tigris::counties() %>% 
  as("sf") %>% 
  left_join(counties, by = "GEOID")

head(counties_sf)

Simple feature collection with 6 features and 25 fields
geometry type:  MULTIPOLYGON
dimension:      XY
bbox:           xmin: -123.7283 ymin: 18.11774 xmax: -65.81565 ymax: 46.38562
epsg (SRID):    4269
proj4string:    +proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs
  STATEFP COUNTYFP COUNTYNS GEOID        NAME              NAMELSAD LSAD CLASSFP MTFCC CSAFP CBSAFP METDIVFP FUNCSTAT      ALAND   AWATER    INTPTLAT
1      31      039 00835841 31039      Cuming         Cuming County   06      H1 G4020  <NA>   <NA>     <NA>        A 1477895811 10447360 +41.9158651
2      53      069 01513275 53069   Wahkiakum      Wahkiakum County   06      H1 G4020  <NA>   <NA>     <NA>        A  680956787 61588406 +46.2946377
3      35      011 00933054 35011     De Baca        De Baca County   06      H1 G4020  <NA>   <NA>     <NA>        A 6016761713 29147306 +34.3592729
4      31      109 00835876 31109   Lancaster      Lancaster County   06      H1 G4020   339  30700     <NA>        A 2169240199 22877180 +40.7835474
5      31      129 00835886 31129    Nuckolls       Nuckolls County   06      H1 G4020  <NA>   <NA>     <NA>        A 1489645187  1718484 +40.1764918
6      72      085 01804523 72085 Las Piedras Las Piedras Municipio   13      H1 G4020   490  41980     <NA>        A   87748363    32509 +18.1871483
      INTPTLON           county_name state state_fips county_fips fips_class  CSA  CBSA population                       geometry
1 -096.7885168         Cuming County    NE         31         039         H1 <NA>  <NA>       9139 MULTIPOLYGON (((-97.01952 4...
2 -123.4244583      Wahkiakum County    WA         53         069         H1 <NA>  <NA>       3978 MULTIPOLYGON (((-123.4364 4...
3 -104.3686961        De Baca County    NM         35         011         H1 <NA>  <NA>       2022 MULTIPOLYGON (((-104.5674 3...
4 -096.6886584      Lancaster County    NE         31         109         H1  339 30700     285407 MULTIPOLYGON (((-96.9106 40...
5 -098.0468422       Nuckolls County    NE         31         129         H1 <NA>  <NA>       4500 MULTIPOLYGON (((-98.27367 4...
6 -065.8711890 Las Piedras Municipio    PR         72         085         H1 <NA>  <NA>         NA MULTIPOLYGON (((-65.91048 1...
Appending Spatial Points Attributes to Spatial Lines Data Frame by Line ID

Appending Spatial Points Attributes to Spatial Lines Data Frame by Line ID


By : user3185026
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I think I cracked it. The key is to use sp::merge to ensure that attributes get written back to points. Then invoke the @data element. then it is just like a regular merge.
code :
Points<-snapPointsToLines(Clipped_Points, Clipped_Street, maxDist=0.1, withAttrs = TRUE, idField="identifier")

Points_agg<-Points@data %>% group_by( nearest_line_id) %>% tally()

Clipped_Street@data<-sp::merge(Clipped_Street@data,Points_agg,by.x="identifier",by.y="nearest_line_id", all.x=TRUE )
How to represent spatial data in Cassandra

How to represent spatial data in Cassandra


By : Ruth Williams
Date : March 29 2020, 07:55 AM
hop of those help? This presentation was pretty interesting, on the topic of spatial data in Cassandra, and may help:
http://www.readwriteweb.com/cloud/2011/02/video-simplegeo-cassandra.php
How to represent geo spatial circular or Polygon area in spring data neo4j spatial?

How to represent geo spatial circular or Polygon area in spring data neo4j spatial?


By : Gary Guo
Date : March 29 2020, 07:55 AM
help you fix your problem You should also be able to use the polygon representation in the WKT field, not sure it works but it should. As it will index the bounding box of the polygon.
With SDN 3.1.M1 there is also more support for geo-types like polygon, circle and box which make it a bit easier to work with.
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