ChartTiff DEMs   ChartTiff Digital Elevation Models
  Select Individual DEM Quads
Select 30 or 60 Meter DEM Quads.

Quads are available via Internet Download  or USB Flash / External Drive
       with payment via Credit Card or Subscription.

Projection and format information is selected during Check Out.
     Select UTM, State Plane, Latitude / Longitude or Web Mercator Projection
     The projection information applies for complete order.
     If multiple projections are required please submit multiple orders.

File Format Selectable at Check-Out
     USGS DEM Format
     GeoTIFF Format
     ESRI Grid Float Format
     PLS-CADD ASCII Text, X,Y,Z format
     ASCII Text, X,Y,Z (Comma, Tab or Space Delimited) formats
     C Tech File Format

User can add a DEM Shaded Relief Model during Check Out

A DEM Quad is available as 1 Free Download

ChartTiff Interactive
Try our totally interactive geo-graphical interface
for selecting and ordering data.

ChartTiff Interactive Topo Map Locator
Select Quads by Place Name:              
Select Quads by State / County:
 Sample returns all Counties for the state of Alabama
Select Quads by Quad Name:
  Sample returns Aspen, VA and Aspen Lake, OR
 Select Quads by Number:
OYYXXXrc  where:
O = C, F, O, I, L, K or P
XX = Latitude (18 to 71)
YYY = Longitude (066 to 185)
r = Quad Row (a thru h)   
c = Quad Column (1 thru 8)
Sample returns O46098h1 through O46098h8
 Select Quads by Point:
  Returns Individual Quads containing point.
  Input as Decimal Degrees (35.75)
      or as Degrees Minutes Seconds (35 30 15) / (35d 30m 15s) / (35.30.15)

Latitude:     Longitude:   
   Sample returns  44121a2
Select Quads by GoogleMaps Location
Use our GoogleMaps interface to locate your location of interest.
Set a marker to select the location.
 Select Quads by Area:
  Returns Individual Quads within Specified Area.
  Input as Decimal Degrees (35.75)
      or as Degrees Minutes Seconds (35 30 15) / (35d 30m 15s) / (35.30.15)

Northern Latitude:  
Western Longitude:  Eastern Longitude: 
Southern Latitude:  

  Sample returns O47099a1 thru 47099a2 and O47099b1 thru 47099b2
Select Quads by a GoogleMaps Area
Use our GoogleMaps interface to locate your area of interest.
Set 2 markers to select the area.