April 27, 2000

SCOS Clickmap 1.0

Disclaimer:  SCOS Clickmap is offered as "freeware" for the convenience of our collaborators and the public.  It is the user's responsibility to determine the applicability of this software for any use.  The California Air Resources Board offers no warranty, express or implied, for the quality or performance of this program or for the accuracy of any data incorporated in it.

Notes to the User:

This program creates map artwork showing the measurement network operated during the 1997 Southern California Ozone Study conducted jointly by the California Air Resources Board and the National Research Strategy for Tropospheric Ozone consortium (SCOS'97-NARSTO).

To facilitate customization by the user for incorporation into illustrations for presentations or publications, the map artwork created by SCOS Clickmap has no text, labels, or legends.  For this reason, instead of a print utility, the program is set up for the maps to be copied to the Windows Clipboard for modification in generic paint or graphics programs.  The user is strongly encouraged to postpone adding labeling, legends, north arrows, etc. until AFTER the maps have been re-sized for import into the final product to minimize loss of graphic quality.

The following information is provided to assist the user in resizing or modifying the maps.

SCOS Clickmap draws maps on either of two basemaps: a regional map labeled "SCOS Domain," and a local map labeled "SoCAB Region."

The SCOS Domain region covers the entire SCOS'97-NARSTO modeling domain, which includes all of California south of 36 degrees latitude and some surrounding portions of Nevada, Arizona, and Baja California; this map base covers the quadrilateral:

Latitude 32 to 36 North
Longitude 114 to 122 West

The SCOS Domain basemap employs a rectilinear map projection in which latitude and longitude are plotted as Cartesian coordinates with a scale ratio of roughly longitude = 0.8 * latitude.  

The source bitmaps are 640 x 393 pixels (9690 x 6135 "twips").

Three versions of this basemap are supplied:
- a plain basemap consisting of only a land-sea outline,
- a "Terrain Rendering" base which adds to the land-sea outline a shaded-relief map based on 1-km generalized topography, and
- a "Landsat False Color" base consisting of a graphic mosaic of Landsat images in which green (live) vegetation is rendered as red based on its reflectivity in the near-infrared.  Image resolution in this composite is about 1 km.  This image does not exactly fit the map projection used for the basemap and terrain renderings; its approximate limits are:
Latitude 32.01 to 36.09 North
Longitude 114.28 to 121.82 West


The SoCAB Region map focuses on the South Coast Air Basin, which includes the greater Los Angeles urban area.  This map base covers the quadrilateral:

Latitude 33.333 to 34.443 North
Longitude 116.556 to 118.750 West

The SoCAB Region maps employ a rectilinear map projection in which latitude and longitude are plotted as Cartesian coordinates with a scale ratio of roughly longitude = 0.83 * latitude (cosine of 34 degrees). 

The source bitmaps are 638 x 383 pixels (9660 x 6120 "twips").

Three versions of this basemap are supplied:
- a plain basemap consisting of only a land-sea outline,
- a "Terrain Rendering" base which adds to the land-sea outline a shaded-relief map based on 1-km generalized topography, and
- a "Landsat False Color" base consisting of a fraction of the SCOS Domain graphic mosaic of Landsat images in which green (live) vegetation is rendered as red, based on the reflectivity chlorophyll in the near-infrared.  Picture resolution in this composite is about 1 km.
This image does not exactly fit the map projection used for the basemap and terrain renderings; its latitude and longitude limits are the same, but the bitmap dimensions are 639 x 382 pixels (9675 x 6105 "twips").


Tony VanCuren
California Air Resources Board
Research Division