Spatial

3D clustering Algorithm

由 三世轮回 提交于 2020-01-11 16:30:42
问题 Problem Statement: I have the following problem: There are more than a billion points in 3D space. The goal is to find the top N points which has largest number of neighbors within given distance R. Another condition is that the distance between any two points of those top N points must be greater than R. The distribution of those points are not uniform. It is very common that certain regions of the space contain a lot of points. Goal: To find an algorithm that can scale well to many

3D clustering Algorithm

由 纵饮孤独 提交于 2020-01-11 16:27:20
问题 Problem Statement: I have the following problem: There are more than a billion points in 3D space. The goal is to find the top N points which has largest number of neighbors within given distance R. Another condition is that the distance between any two points of those top N points must be greater than R. The distribution of those points are not uniform. It is very common that certain regions of the space contain a lot of points. Goal: To find an algorithm that can scale well to many

Google maps spatial reference system

由 寵の児 提交于 2020-01-10 19:37:11
问题 What is Google map's spatial reference system using when you enter a lat, long into the maps search bar? I've found hints that it might be WGS84 but after converting to that coordinate system, nothing shows up when i paste the coordinates into the google maps search box. I am converting from GDA MGA 56. Sample: Input MGA56 coords: 336301, 6253363 Expected WGS86 coords: -33.8473340793201, 151.230631835944 I get: 16834916.928327594 -4008321.1020318186 Spatial coord systems: EPSG:28356 for MGA56

java.lang.ClassCastException: org.jboss.jca.adapters.jdbc.jdk6.WrappedConnectionJDK6 cannot be cast

由 六眼飞鱼酱① 提交于 2020-01-10 14:45:13
问题 Application Version: JBoss 7.0.0, Oracle 11g (ojdbc6.jar) and JDK 6 version I have a problem when I am trying to insert the value for CLOB Data type using CLOB.createTemporary function, getting the below exception. java.lang.ClassCastException: org.jboss.jca.adapters.jdbc.jdk6.WrappedConnectionJDK6 cannot be cast to oracle.jdbc.OracleConnection After searching in multiple forums, did not find any solution. https://forums.oracle.com/forums/thread.jspa?threadID=279238 Basic steps required to

java.lang.ClassCastException: org.jboss.jca.adapters.jdbc.jdk6.WrappedConnectionJDK6 cannot be cast

由 寵の児 提交于 2020-01-10 14:45:11
问题 Application Version: JBoss 7.0.0, Oracle 11g (ojdbc6.jar) and JDK 6 version I have a problem when I am trying to insert the value for CLOB Data type using CLOB.createTemporary function, getting the below exception. java.lang.ClassCastException: org.jboss.jca.adapters.jdbc.jdk6.WrappedConnectionJDK6 cannot be cast to oracle.jdbc.OracleConnection After searching in multiple forums, did not find any solution. https://forums.oracle.com/forums/thread.jspa?threadID=279238 Basic steps required to

Looking for the opposite of SqlGeometryBuilder: How can I decompose a SqlGeometry?

由 感情迁移 提交于 2020-01-07 02:50:06
问题 I know how to compose a SqlGeometry using SqlGeometryBuilder , for example: // using Microsoft.SqlServer.Types; SqlGeometryBuilder geometryBuilder = new SqlGeometryBuilder(); geometryBuilder.SetSrid(…); geometryBuilder.BeginGeometry(OpenGisGeometryType.Polygon); geometryBuilder.BeginFigure(0, 0); geometryBuilder.AddLine(…); … geometryBuilder.EndFigure(); geometryBuilder.EndGeometry(); SqlGeometry geometry = geometryBuilder.ConstructedGeometry; Once a SqlGeometry is built, it's pretty much an

导出数据库所有索引

由 孤街浪徒 提交于 2020-01-06 17:10:40
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 导出创建自增字段语句： SELECT CONCAT( 'ALTER TABLE `', TABLE_NAME, '` ', 'MODIFY COLUMN `', COLUMN_NAME, '` ', IF(UPPER(DATA_TYPE) = 'INT', REPLACE( SUBSTRING_INDEX( UPPER(COLUMN_TYPE), ')', 1 ), 'INT', 'INTEGER' ), UPPER(COLUMN_TYPE) ), ') UNSIGNED NOT NULL AUTO_INCREMENT;' ) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = '18y' AND EXTRA = UPPER('AUTO_INCREMENT') ORDER BY TABLE_NAME ASC 导出所有索引： SELECT CONCAT('ALTER TABLE `',TABLE_NAME,'` ', 'ADD ', IF(NON_UNIQUE = 1, CASE UPPER(INDEX_TYPE) WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX' WHEN 'SPATIAL' THEN 'SPATIAL INDEX'

R - Spatial Join Between SpatialPoints (GPS coordinates) and SpatialLinesDataFrame

由 安稳与你 提交于 2020-01-06 06:07:02
问题 I am working on a university project which combines data science and GIS. We need to find an open-source solution capable of obtaining additional information from a massive GPS coordinates dataset. Clearly, I cannot use any API with daily request limit. THE DATA Here you can find a sample of the dataset the Professor provided us: longitude <- c(10.86361, 10.96062, 10.93032, 10.93103, 10.93212) latitude <- c(44.53355, 44.63234, 44.63470, 44.63634, 44.64559) longlat <- data.frame(longitude,

Subtracting a SQL Server geometry from another

由 会有一股神秘感。 提交于 2020-01-06 03:11:26
问题 Is there a way to subtract a geometry from another? A kind of reverse STUnion.. The problem I am having is that I need to ensure a shape fits within another (without changing the larger shape). I thought I could use the STIntersection to get the shape thats "in". However, STIntersection is not accurate and produces a shape that can (and does) not equate to the true intersection. You can easily see this if you then take the STDifference of the original shape. So , what I would like to do is

How do I plot PostGIS geometries using geom_sf?

由 ∥☆過路亽．° 提交于 2020-01-05 05:26:11
问题 Data source is PostgreSQL database with PostGIS geometry types. I have no problem querying the data I want directly from SQL into a data.frame using the RPostgreSQL package. Since R complains about raw geom types, I use ST_AsText() on the geoms in the SQL query so that they are stored as character type in a data.frame . I have three types: POINT , LINESTRING , and POLYGON . Note that my data is geometry (e.g., Cartesian x,y,z coordinates), not map-projected geography. Had a bit of trouble
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