SDX (Spatial Data Exchange)

GISBox is a one-stop 3D GIS data editing, conversion and publishing platform that supports editing in multiple GIS formats such as OSGB/GEOTIFF/RVT, converting to 3DTiles/Terrain and publishing.

Introduction

SDX (Spatial Data Exchange) is a common file format used to share and transfer spatial data between different GIS software. It can contain vector data and raster data, as well as attribute information related to them. They can store the geometry, topological relationships, attribute data, and spatial reference information of geographic features. By using SDX files, users can import, export, and share geographic data in different GIS software to achieve data interoperability and scalability.

File Structure

SDX files are mainly composed of the following parts:

**Geometry: **stores the geometry information of geographic features, such as points, lines, and surfaces.
**Topological relationships: **describes the spatial relationship between geographic features, such as adjacency, inclusion, etc.
**Attribute data: **contains various attribute information related to geographic features, such as name, type, value, etc.
**Spatial reference information: **provides spatial reference system information of geographic features, such as coordinate system, projection mode, etc.

Pros

Support for multiple data types: The GeoTIFF format can handle multiple data types including remote sensing images, elevation data, vector data, etc., providing great flexibility for the storage of geographic information data.
**Embedded geographic information: **This format supports embedding geographic information such as geographic coordinates, projection information, ellipsoid parameters into image files.
Wide support: The GeoTIFF format is supported by a wide range of GIS software and geographic information systems.
Efficient storage: The GeoTIFF format supports lossless compression, which can reduce file size and improve storage efficiency without losing image quality.
Wide application scenarios: The GeoTIFF format is suitable for various geographic information application scenarios.

Cons

Large file size: Although the GeoTIFF format supports lossless compression, the file size may still be large when it is not compressed, and it takes up more storage space.
Transmission and loading speed may be slow: Due to the relatively large file size, data in the GeoTIFF format may have certain delays in network transmission and loading speed.
High learning and use costs: The GeoTIFF format is relatively complex, and users need to have certain geographic information knowledge and technical background to effectively use and process data in this format.
There may be differences in the standards implemented by different institutions: Due to the differences in the implementation of the GeoTIFF format by different institutions, this may lead to a certain degree of incompatibility.

Application Scenario

The SDX file format can be used for data exchange and sharing, making data sharing between different GIS platforms more convenient. At the same time, SDX files are also widely used in map production and display, which can store the geometric shape, attribute data and spatial reference information of geographic elements to achieve map customization and display. In addition, SDX files also support spatial analysis and modeling, and can achieve decision-making and planning by analyzing and modeling the geographic spatial data in the file.

Example

Convert sdx to zip.

SDX file.