![]() ![]() If you choose to georeference a raster you will see the following dialog: If the coordinate system is undefined you will be prompted to georeference the raster. If the raster has a coordinate system defined it will be drawn on the map. tiff), ARC/INFO and Space Imaging BIL (.bil), ARC/INFO and Space Imaging BIP (.bip), ARC/INFO and Space Imaging BSQ (.bsq), DTED Level 0-2 (.dted), ERDAS 7.5 LAN (.lan), ERDAS 7.5 GIS (.gis), JP2 (.jp2), MrSID (.sid), RAW (.raw), NTIF (.ntf), USGS ASCII DEM (.dem), X11 Pixmap (.xpm), PC Raster (.map), PCI Geomatics Database File (.pix), JPC (.jpc), J2C (.j2c), J2K (.j2k), HDF (.hdf), BSB (.kap), Raster Product Format RPF, CIB, CADRG (.toc), DIGEST ASRP & USRP (.img). jpeg), Portable Network Graphics (.png), Graphics Interchange Format (.gif), Tagged Image File Format (.tif. and browse for an image file to add.ĪrcGIS Explorer supports the display of many raster formats, including: Imagine image (.img), bitmap (.bmp), JPEG (.jpg. On the Home tab, in the Map group, click Add Content and then click Raster Data. Agriculture is respresented in brown, water in blue, bare ground in yellow, a variety of deciduous and non-deciduous trees in shades of green, and urban/developed land in gray. For example, you can process data through a geoprocessing model to create a raster dataset that maps suitability for a specific activity.īelow is an example of a classified raster dataset showing land use. ![]() Thematic maps can also result from geoprocessing operations that combine data from various sources such as vector, raster, and terrain data. Basically, this activity groups the values of multispectral data into classes (such as vegetation type) and assigns a categorical value. A common analysis application is classifying a satellite image by land-cover categories. Rasters representing thematic data can be derived from analyzing other data.The raster below displays elevation-using green to show lower elevation and red, pink, and white cells to show higher elevation. Elevation values measured from the earth's surface are the most common application of surface maps, but other values, such as rainfall, temperature, concentration, and population density, can also define surfaces that can be spatially analyzed. They also provide a regularly spaced representation of surfaces. They provide an effective method of storing the continuity as a surface. Rasters are well suited for representing data that changes continuously across a landscape (surface).Three main sources of raster basemaps are orthophotos from aerial photography, satellite imagery, and scanned maps.īelow is a raster used as a basemap for road data. For example, orthophotographs displayed underneath other layers provide the map user with confidence that map layers are spatially aligned and represent real objects as well as additional information. A common use of raster data in a GIS is as a background display for other feature layers.In ArcGIS Explorer the uses of raster data as layers may be categorized as follows: While the structure of raster data is simple, it is exceptionally useful for a wide range of applications. Thematic and continuous rasters may be displayed as layers along with other geographic data on your map. ![]() Thematic data (also known as discrete), representing features such as land-use or soils dataĬontinuous data, representing phenomena such as temperature, elevation, or spectral data such as satellite images and aerial photographs Rasters are digital aerial photographs, imagery from satellites, digital pictures, or even scanned maps.ĭata stored in a raster format represents real-world phenomena, such as In its simplest form, a raster consists of a matrix of cells (or pixels) organized into rows and columns (or a grid) where each cell contains a value representing information, such as temperature. Feedback E-mail this topic Print this topic ![]()
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