ChartTiff Topographic Maps   ChartTiff Topographic Maps
About ChartTiff Topographic Maps Select ChartTiff Topographic Maps Request ChartTiff Topographic Maps Samples of ChartTiff Topographic Maps Tags used in ChartTiff Topographic Maps
 

  ChartTiff Geo's and DRGs

  Collarless / Seamless Topographic Maps and Collared Digital Raster Graphics (DRGs)

  ChartTiff Geo's are generated with latest USGS DRGs available
  Totally Collarless  and Seamless Topographic Maps

  • No Setting Clipping or Setting a Transparency Layer required
    Plug compatible with your GIS System

  • Complete Coverage of the US including Alaska and Hawaii

  • Includes all 1:24,000, 1:100,000 and 1:250,000 scale files

  • 250 DPI resolution, 256 color palette

  • Standard GeoTiff format enhanced with ChartTiff Extensions
    Plus ESRI "tfw" and MapInfo "tab" files.

  • Optional JPEG format.  Selectable at Check-Out.

  • Add Shaded Relief to Geo Topographic Maps
     Click here for details

   Collared DRG's standard USGS collared Topographic Maps

  • Complete Coverage of the US including Alaska and Hawaii

  • Includes all 1:24,000, 1:100,000 and 1:250,000 scale files

  • 250 DPI resolution, 256 color palette

  • Standard GeoTiff format enhanced plus ESRI "tfw" and MapInfo "tab" files.

  • Optional JPEG format.  Selectable at Check-Out.

  • Add ChartTiff Enhanced DRG Collars
     Click here for details

  • Add Shaded Relief to DRG Topographic Maps.
     Click here for details

Topographic Maps Sold by State                               Order a Full State of Topographic Maps
  • Any projection available 
         - UTM- User Selectable Zones and datum
        - State Plane - User Selectable Zones and datum
         - Latitude / Longitude - User Selectable datum                                       
         - Request a quote for other projections.  See REQUEST


    Scales Available
          -
    1:24,000 Scale ChartTiff Geo's (Collarless / Seamless DRGs)
          - 1:100,000 Scale ChartTiff Geo's (Collarless / Seamless DRGs)
          - 1:250,000 Scale ChartTiff Geo's (Collarless / Seamless DRGs)
          - 1:24,000 Scale ChartTiff DRG's (Collared DRGs)
          - 1:100,000 Scale ChartTiff DRG's (Collared DRGs)
          - 1:250,000 Scale ChartTiff DRG's (Collared DRGs)

Topographic Maps Sold by Full Degree                     Order a Full Degree of Topographic Maps

  • Any projection available                                        $50.00 / Degree
         - UTM- User Selectable Zones and datum
        - State Plane - User Selectable Zones and datum
         - Latitude / Longitude - User Selectable datum                                       
         - Request a quote for other projections.  See REQUEST

  • Includes all 1:24,000, 1:100,000 and 1:250,000 scale files.

  • Includes ESRI ".tfw" and MapInfo ".tab" World files

  • Includes the Full set of Original collared USGS DRG's

 

Topographic Maps Sold by Individual Quad              Order Individual Topographic Map
  • Available via Download and USB Flash / External Drive 
            
  • Any Collarless / Seamless Geo Quad only    $2.00
    Any Original Collared USGS DRG Quad only $1.00


  • Available Projections
    UTM - User Selectable Zones - NAD27 / NAD83 / WGS72 /  WGS84
    State Plane - User Selectable Zones - NAD27 / NAD83
    Latitude / Longitude - NAD27 / NAD83 / WGS72 /  WGS84
Topographic Maps Sold as Custom Area Geo            Order a Custom Area Topographic Map
  • Available via Download and USB Flash / External Drive 
  • Any Collarless / Seamless Geo Quad
    Areas available from 3.75 Minutes to 5 Degrees Width / Height, 
             based on scale:


  • Available Projections
    UTM - User Selectable Zones - NAD27 / NAD83 / WGS72 /  WGS84
    State Plane - User Selectable Zones - NAD27 / NAD83
    Latitude / Longitude - NAD27 / NAD83 / WGS72 /  WGS84

 

Topographic Maps Sold as Custom Area DRG            Order Custom Area Topographic Map
  • Available via Download and USB Flash / External Drive 
  • Custom Area Topographic Maps with collars and legends ready for plotting 
    Areas available from 3.75 Minutes to 6 Degrees Width / Height, 
             based on scale:


  • Available Projections
    UTM - User Selectable Zones - NAD27 / NAD83 / WGS72 /  WGS84
    State Plane - User Selectable Zones - NAD27 / NAD83
    Latitude / Longitude - NAD27 / NAD83 / WGS72 /  WGS84
  •  A ChartTiff Geo map is created from the original USGS DRG topographic maps.  The quad is first projected to your requested projection,  then cropped to the map extents.  The voided areas of the map are then filled with the necessary adjacent map information to make the map and Tiff file rectangular.
  • ChartTiff Geo raster images are geometrically registered at the pixel level from map to map; even from degree to degree.   ChartTiff Geo raster images allow for easy panning from one map to another, without worrying about map overlap and transparency problems associated with other map products.

Original USGS Topographic Maps

Normal USGS DRG with collars

ChartTiff Geo Topographic Maps

ChartTiff Geo without collars

QUAD Naming Convention

Quad name format was developed by the USGS and is used to specify the geographic location of a quad map in latitude / longitude coordinates. For example, for quad name O34119d6, the letter "O" specifies the map scale 1:24,000. The number 34 specifies base latitude of 34 degrees, and the number 119 specifies base longitude of 119 degrees.

Each 1:24,000 map location is 7.5 minutes by 7.5 minutes; which equates to 8 x 8 = 64 quad locations in a 1 degree by 1 degree square of geographical area. The 8 rows and 8 columns of quad locations within each square degree are designated by the last
2 letters of the quad name. In this example (O34119d6), the quad is the fourth row (the letter 'd'), and sixth column (the digit '6').  Rows are designated from 'a' (south-most) to 'h' (north-most), and columns are designated from '1' (east-most) to '8' (west-most). The 64 quad locations for the example are:
 

  Latitude 35  

Longitude
120

h8 h7 h6 h5 h4 h3 h2 h1
g8 g7 g6 g5 g4 g3 g2 g1
f8 f7 f6 f5 f4 f3 f2 f1
e8 e7 e6 e5 e4 e3 e2 e1
d8 d7 d6 d5 d4 d3 d2 d1
c8 c7 c6 c5 c4 c3 c2 c1
b8 b7 c6 b5 b4 b3 b2 b1
a8 a7 a6 a5 a4 a3 a2 a1

Longitude
119

 

Latitude 34

 


The following table lists the partial degree values for the
bottom (south) edge of each quad location:

  decimal minutes/seconds
a 0.000 00' 00"
b 0.125 07' 30"
c 0.250 15' 00"
d 0.375 22' 30"
e 0.500 30' 00"
f 0.625 37' 30"
g 0.750 45' 00"
h 0.875 52' 30"

The following table list the partial degree values for the
right (east) edge of each quad location:

  decimal minutes/seconds
1 0.000 00' 00"
2 0.125 07' 30"
3 0.250 15' 00"
4 0.375 22' 30"
5 0.500 30' 00"
6 0.625 37' 30"
7 0.750 45' 00"
8 0.875 52' 30"

For a more detailed description of quad name standards, see:

                       http://topomaps.usgs.gov/drg/drg_name.html

MAP SCALES

ChartTiff maps use the USGS file naming convention, in which the first letter of the file name determines the size and scale of the file:

Letter Scale Width Height Comment
C 1:250,000 2 degrees 1 degree  
F 1:100,000 1 degree 0.5 degree  
O 1:24,000 7.5 minutes 7.5 minutes  
P 1:24,000 7.5 minutes 7.5 minutes Orthophoto
L 1:25,000 7.5 minutes 7.5 minutes  
K 1:25,000 15 minutes 7.5 minutes  
I 1:63,360 20,22.5,30,36
minutes
15 minutes Alaska only


The remainder of the file name includes the encoded values of latitude, longitude, and relative location of the map image.  For more information on USGS standards, see:

                      http://topomaps.usgs.gov/drg/drg_name.html

Note: Most 7.5 x 7.5 minute USGS maps are distributed as O files (1:24,000 scale), but some are only available as P, L, or K files.  Therefore, some ChartTiff DRG files are only available as P, L, or  K files. ChartTiff Geo files (collarless/seamless maps) are
automatically processed into corresponding O files.

For additional information -- Please Phone:
1 (303) 774-8769

or Complete Form:
Contact ChartTiff

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