opengis

OpenGIS (Open geodata interoperation specification, ogis-open geographic data interoperability specification) was proposed by the American OGC (OpenGIS Association, OpenGIS Consortium. As a non-profit organization, OGC aims to promote the adoption of new technologies and business methods to improve the interoperability of geographic information processing ), it i

On the date of the foss4 g conference, I will introduce some OpenGIS standards, architectures, and software for implementation on the blog recently. On the one hand, I will give a quick start overview to my friends who are interested in this trip, and on the other hand, I will summarize my recent years of access to OpenGIS. OpenGIS defines a set of data-based se

On the date of the foss4 g conference, I will introduce some OpenGIS standards, architectures, and software for implementation on the blog recently. On the one hand, I will give a quick start overview to my friends who are interested in this trip, and on the other hand, I will summarize my recent years of access to OpenGIS. OpenGIS defines a set of data-based ser

a common format that is easy to store. (4) Data manipulation: When the data is stored in the system, the user can carry on a series of operations to the data, the GIS operation usually is provided to the user in the form of a tool bag, the toolkit includes basic data operation and analysis function, such as: Data retrieval, area perimeter measure, coordinate transformation, projection transform, picture edge and so on. (5) Data analysis: GLS's core lies in its strong analytical ability, such as

geographic coordinates, projections, and other information for all bands. datasets also contain metadata that is a string list consisting of strings (names: values. Gdal dataset is implemented based on the description of OpenGIS grid data.2. Coordinate System (coordinatesystem) The coordinate system in the dataset is based on the WKT (wellknown text) string format of OpenGIS. It contains the following cont

famous GIS products use gdal/OGR libraries, including arggis 9.2 of ESRI, Google Earth, and cross-platform grass GIS systems. OGR provides read and write support for vector data format, it supports file formats include: ESRI shapefiles, S-57, SDTS, postgis, Oracle Spatial, MapInfo mid/MIF, MapInfo tab.1) OGR Architecture OGR includes the following parts: Geometry: Class geometry (including ogrgeometry and other classes) encapsulates the Vector Data Model of

Build a collection of WebGIS tools using open-source software Advantages of using open-source software to build a WebGIS system:(1) The cost is low and the scalability is strong. The building process is also a learning and research process.(2) Open Source GIS software must comply with OpenGIS specifications. After nearly one month of research, I adopted the following Architecture:(1) data, which uses the National Basic Geographic Information System o

lines) that applies to all the bands. The dataset is also responsible for the georeferencing transform and coordinate system definition of all bands. The dataset itself can also has associated metadata, a list of name/value pairs in string form.Note that the GDAL dataset, and raster band data model are loosely based on the OpenGIS Grid coverages specification.The red part is what we should pay attention to in the specific raster data processing, incl

management of spatial data integrates with the Universal database system, the spatial data can be accessed by object, the space operation and processing in the database kernel, the extension of SQL is convenient, and the data sharing and interoperability are easy to realize. Its shortcomings are mainly manifested in the difficulty of implementation, compression data is difficult, the current function and performance and the first type of system there is still a gap.At present, the most excellen

Adapted from: the glory of the beasts Spatial databases, using PostgreSQL/postgis. Use PostgreSQL 8.0 Win32 on Windows platform, which can be obtained from www.postgresql.org. This version already contains postgis. You must select the postgis option during installation. Postgis implements the OpenGIS Simple Feature Specification and provides spatial indexes. Postgis official site: http://postgis.refractions.net /. GIS middleware uses geotools. g

how to build your own WebGIS system? Do you need to spend a lot of money to buy other people's money or do it yourself? I think this should be taken into consideration based on your actual situation. If you are rich and willing to spend money, I can't help it. But if you want me to be the same, have no money, but have a deep passion for GIS, then do your open source WebGIS system. Spatial Database: PostgreSQL/postgis is used. Use PostgreSQL 8.0 Win32 on Windows platform, which can be obtained f

How can we build our own WebGIS system? Do you need to spend a lot of money to buy other people's money or do it yourself? I think this should be taken into consideration based on your actual situation. If you are rich and willing to spend money, I can't help it. But if you want me to be the same, have no money, but have a deep passion for GIS, then do your open source WebGIS system. spatial database : PostgreSQL/postgis is used. Use PostgreSQL 8.0 Win32 on Windows platform, which can be ob

SharpmapSharpmap is a map rendering class library based on. NET 2.0 that uses C # to render GIS data in the form of Esri Shape, PostGIS, MS SQL, and other formats by extending the map data provider, such as those developed by other authors Oracle Spatial Provider. Sharpmap can be applied to desktop and web programs.Links: Http://www.codeplex.com/SharpMapNettopologysuiteNettopologysuite is the c#/.net version of the famous JTS topology suite, referred to as NTS. JTS topology Suite is a

grating data ). Dataset also specifies a coordinate system for the corresponding grating data. Dataset itself can also contain metadata, which are organized in a key/Value Pair mode. The gdal dataset is defined based on the OpenGIS grid coverages format.Coordinate System The dataset coordinate system is defined by the OpenGIS WKT string, which includes: A global coordinate system name. A geographic coordin

I. Introduction For more information, see http://www.gdal.org/ogr/osr_tutorial.html. OgrspatialreferenceClass andOgrcoordinatetransformationClass is mainly used to provide the definition coordinate system (projection and level) and the conversion coordinate. Both classes are based on the coordinate conversion instructions of OpenGIS and use wellKnown text format to express the coordinate system. Some information about the

C and C ++ and can only contain one grid format. Another library is called OGR Simple Features Library (formerly called OpenGIS Simple Features reference implementation). Although it is built to adapt to the vector format existing in the gdal source tree, OGR depends on gdal. In fact, without the open-source license of gdal, most modern geospatial data viewers will be incredible. This library provides programmers with a common data model, including a

OpenGISWhat is OGC provides a comprehensive set of specifications for access to geographic data and geographic information resources in a distributed environment. It includes abstract and implementation specifications. Various vendors develop GIS software in accordance with the specifications set by OpenGIS, and some software can achieve interoperability. OGIS (Open Geodata Interoperability Specification )-Open Geospatial data interoperability specifi

directly used by name. Epsg: N: the coordinate system (projection or geographic coordinate) can be selected using the epsg code. For example, epsg 27700 is a UK country grid. More epsgloud systems can be found in the gdaldata file gcs.csvand pcs.csv (in the data folder in the gdal directory ). Proj.4 definition: A proj4 definition string can be used as a coordinate system definition. For example, "+ proj = UTM + zone = 11 + datum = WGS84 ". Note that you must keep the proj4 string together in t

has many origins with grass. It focuses more on graphic interface identification and map visualization. Open-source GIS middleware in the Java camp Geotools provides a wide range of class libraries for GIS data processing and spatial analysis. The underlying layer uses JTs (Java topology suite) to implement spatial topology and analysis functions. Java open source GIS System Refractions research, a leader in open-source GIS, presided over the development of a number of GIS projects, includi

Reprinted from Http://blog.chinaunix.net/uid-20083-id-2974364.htmlJTS official website: http://tsusiatsoftware.net/jts/main.html/httpWww.vividsolutions.com/jts/main.htm SVN Address: http://jts-topo-suite.svn.sourceforge.net/viewvc/jts-topo-suite/ Geotools Official website: http://www.geotools.org/http://docs.geotools.org/stable/userguide/quickstart.html OpenGIS official website:/http Www.opengeospatial.org/java anti-compiler Jd-gui:http://java.decompi