spatial hadoop

Spatial data mining refers to the theory, methods and techniques of extracting the hidden knowledge and spatial relations which are not clearly displayed from the spatial database and discovering the useful characteristics and patterns. The process of spatial data mining and knowledge discovery can be divided into seve

Wang Jialin's in-depth case-driven practice of cloud computing distributed Big Data hadoop in July 6-7 in Shanghai Wang Jialin Lecture 4HadoopGraphic and text training course: Build a true practiceHadoopDistributed Cluster EnvironmentHadoopThe specific solution steps are as follows: Step 1: QueryHadoopTo see the cause of the error; Step 2: Stop the cluster; Step 3: Solve the Problem Based on the reasons indicated in the log. We need to clear th

Spatial Economic computing visualization Visualization is a theory, method, and technology that uses computer graphics and image processing technology to convert data into graphs or images displayed on the screen and perform interactive processing. It involves many fields such as computer graphics, image processing, computer vision, and computer-aided design. It has become a comprehensive technology that studies a series of problems such as data re

[Hadoop] how to install Hadoop and install hadoop Hadoop is a distributed system infrastructure that allows users to develop distributed programs without understanding the details of the distributed underlying layer. Important core of Hadoop: HDFS and MapReduce. HDFS is res

Some additional test results:1. Storage space of geometric objects In order to test the size of the geometric object storage space of Oracle Spatial and ArcSDE in a relatively real environment, two line data and surface data with about 0.1 billion elements are used respectively. Line data only contains geometric information, and surface data also contains some attribute information. Most of the line data only contains two nodes, and the surface data

· Spatial index performance 1. Use of spatial indexes There are generally two phases for spatial queries in a spatial database. For Oracle Spatial, a spatial query is divided into two steps, one called primary filter ), the se

In practical applications, Oracle Spatial not only has all the characteristics related to traditional GIS, but also has the characteristics related to relational databases, these features extend the scope of work of developers in applications and provide their productivity, so as to support a wider range of applications and improve performance, the following are the main characteristics of these features: 1) geometric structure and

This document describes how to operate a hadoop file system through experiments. Complete release directory of "cloud computing distributed Big Data hadoop hands-on" Cloud computing distributed Big Data practical technology hadoop exchange group:312494188Cloud computing practices will be released in the group every day. welcome to join us! First, let's loo

Spatial Interpolation-kerkin interpolation and interpolation of kerkin The Kerry kingfa is an advanced statistical process that generates an estimated surface through a group of Scattered Points with z values. Unlike other interpolation methods in the interpolation tool set, before selecting the best estimation method used to generate the output surface, we effectively use the kerkin tool to study the interaction of

1. Create a spatial index 1) before creating an index, you always need to insert metadata for the space layer. 2) if an index fails to be created, it must be deleted before it can be created. Drop index customers_sidx; Create an index: Create index customers_sidx on customers (location) Indextype is MDSYS. spatial_index During index creation, Oracle checks the sdo_srid of the index column and the SRID in user_sdo_geom_metadata for matching. If not, Or

1. R-tree spatial index Geometric objects in nature are all strange, and managing such data is a headache. Therefore, GIS Engineers simplify the process. One way is to take out the boundary range of the geometric object as a basis for retrieval (the geometric object must be inside it ), this is the range of a rectangle, and it is much easier to manage it. In Oracle Spatial, the R-tree-based

Under the Cd/home/hadoop/hadoop-2.5.2/binPerformed by the./hdfs Namenode-formatError[Email protected] bin]$/hdfs Namenode–format16/07/11 09:21:21 INFO Namenode. Namenode:startup_msg:/************************************************************Startup_msg:starting NameNodeStartup_msg:host = node1/192.168.8.11Startup_msg:args = [–format]Startup_msg:version = 2.5.2startup_msg: classpath =/usr/