LAND INFO has topographic map coverage of over 152 countries. Our maps are available in a variety of digital formats, scales, resolution, and projections and are fully georeferenced and formatted for all GIS/GPS applications.

Please contact us for a LAND INFO representative to assist you in your research.


Geo-referencing

Not only can LAND INFO supply you with digital topographic maps we can supply you with all of your geo-referencing needs. To make our products more user-friendly we can process the map to a projection and datum of your specification.

Geo-referenceing is established by correlating the relationship between an image (row, column) coordinate system and a map (x,y) coordinate system, yielding a digital topographic map opening in GIS software in precise geographic location.

16 Control points selected from paper map	Collars removed during processing.

File Format

• TIFF with TFW
• GeoTIFF
• ASCII
• ERS (ER Mapper)
• MIF (Map Info)
• JPEG with JPW
• Generic Binary
• Img (ERDAS)
• ECW (ER Mapper, compressed)
• MrSid (compressed)


File Sizes

The file sizes will vary according to the specified DPI, Color Table, physical size and density of the map.
Some examples of typical files sizes:
• 400 DPI / 8bit / 20" x 30" / 1:50,000 scale = 80Mb
• 250 DPI / 4bit / 20" x 30" / 1:24,000 scale = 15Mb


Delivery Options

LAND INFO provides several different delivery options:
• FTP
• CD-ROM
• DVD-ROM
• External Firewire/USB 2 Hard Drive


Quality Control

Each topographic map goes through a series of quality control steps to ensure you are provided with the highest quality GIS data for each project. Three steps we use to achieve the highest quality are:

• The raw topographic map is checked against the paper topographic map to verify an accurate digital representation.
• The processed topographic map is carefully inspected to assure that the topographic map is properly geo-referenced.
• The four edges of the processed topographic map are compared to adjoining topographic maps to confirm proper alignment.