The SHP format is a vector data format used to store geographic information system (GIS) data. SHP files consist of a series of ordered files. The shp files we export include .shp, .shx, .dbf, .prj and .fix files. .shp (shape) file: stores vector map data and records the spatial location information of each feature. .shx […]
Tag: eot
java geotools shpfile to featureCollection
Article directory A brief description maven dependencies Sample code Brief description Convert shpfile to featureCollection maven dependencies <dependency> <groupId>org.geotools</groupId> <artifactId>gt-shapefile</artifactId> <version>27.0</version> </dependency> <dependency> <groupId>org.geotools.jdbc</groupId> <artifactId>gt-jdbc-postgis</artifactId> <version>27.0</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-referencing</artifactId> <version>27.0</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-render</artifactId> <version>27.0</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-coverage</artifactId> <version>27.0</version> </dependency> <dependency> <groupId>it.geosolutions.imageio-ext</groupId> <artifactId>imageio-ext-utilities</artifactId> <version>1.4.4</version> </dependency> <!– https://mvnrepository.com/artifact/com.conversantmedia/disruptor –> <dependency> <groupId>com.conversantmedia</groupId> <artifactId>disruptor</artifactId> <version>1.2.15</version> </dependency> […]
20. Creation, addition, deletion and modification of shp based on java-geotools
Inquire Create shp Data preparation let param={<!– –>code: “utf-8″, datalist: [ {<!– –>name:”place”,type:0,height:2.5,geom:”POINT(109.588 34.645)”}, {<!– –>name:”Incitement of Rebellion”,type:2,heigh:3.2,geom:”POINT(109.588 34.645)”} ], filepath: “D:gisdata/gp/aaa/sx_test.shp”, geomfiled: “geom”, keylist: [ {<!– –> filedname: “name”, type: “string” },{<!– –> filedname: “type”, type: “int” },{<!– –> filedname: “heigh”, type: “double” } ], type: “Point” } shp file creation and adding data […]
Java geotools implements heat maps and generates tiff files
Foreword Heatmap is a data visualization technology used to represent the relative density or weight distribution of different areas in the data. It generally displays the popularity of data by using different colors to provide an intuitive understanding of data distribution and trends. Heat maps are commonly used in the following areas: Data density visualization: […]
Solve the NPE exception in geotools processing vector data format conversion
1. Background introduction The project needs to convert shp files of vector data into geojson, which is planned to be implemented through the geotools tool. geotools: GeoTools is an open source Java library for processing geospatial data and performing spatial analysis. It provides a wealth of GIS (Geographical Information System) functions and tools, which can […]
FFmpeg5.0 source code reading – VideoToobox hardware decoding
Abstract: This article describes how the videotoobox decoder in FFmpeg performs decoding and how to decode an encoded code stream into the final naked stream. Keyword: videotoobox, decoder, ffmpeg VideoToolbox is a low-level framework that provides direct access to hardware encoders and decoders. It provides video compression and decompression services, and conversion services between raster […]
FFmpeg hardcoded VideoToolBox process
Introduction FFmpeg has provided codec support for VideoToolBox; the main files involved are videotoolbox.c, videotoolbox.h, videotoolboxenc.c, ffmepg_videotoolbox.c. When compiling FFmpeg source code, if you want to support VideoToolBox, you need –enable-videotoolbox command when configure. Command line ffmpeg -hwaccels to see which hardcoders are supported. ffmpeg supports encoding of videotoolbox h264 and h265, namely h264_videotoolbox, hevc_videotoolbox. […]
JavaGeoTools-Query Tutorial
Table of Contents Introduction Query dependency import code writing Introduction In the process of geographic data processing, querying and filtering data is a very common task. Of course, GeoTools also integrates tools for querying and filtering geographic data. This section will mainly talk about it Query Dependency import First, import the dependencies <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <geotools.version>30-SNAPSHOT</geotools.version> […]
Coordinate Transformations – Read and convert coordinate systems of geospatial tables using GeoTools (SQLServer, PostgreSQL)
Foreword: When importing spatial data into the database through GIS software in business, due to different data sources and software settings, the spatial table coordinate systems that may be imported into the database are various. If you want to publish the database space table to GeoServer and unify the coordinate system, you just simply set […]
JavaGeoTools-Geometry CRS Tutorial
Table of Contents foreword CRS Lab Application expand Geometry Foreword The main content of this chapter is the transformation of the projected graphics coordinate system CRS Lab Application First, import the required dependencies <dependencies> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-shapefile</artifactId> <version>${geotools.version}</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-swing</artifactId> <version>${geotools.version}</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-epsg-hsql</artifactId> <version>${geotools.version}</version> </dependency> </dependencies> <repositories> <repository> <id>osgeo</id> <name>OSGeo Release […]