Usage Notes

REDI may be manipulated by controls on the following panels: Map, Locate, Report, and Legend. The Map panel offers controls devoted to the appearance and navigation of the map. The Locate panel accepts input to search for a specific Assessor’s Parcel Number or an address. Information about individual parcels or summarized demographics of a searched area can be obtained on the Report panel, while the Legend panel simply displays the map legend.

Detailed descriptions of the controls on each panel may be found below, followed by a few tips for using the REDI system.

Map Panel

Controls
  •   Zooms map to entire region.
  •   Zoom In. 1). Click the map once to re-center the map and zoom in by a fixed proportion (50%). 2). Drag the mouse to define a rectangle for which you wish to zoom in (larger scale) a fixed amount at a specific point. If you drag out a big rectangle (i.e., half the size of the map), you will get a 2x zoom in. If you draw out a small rectangle (i.e., 1/10 of the map area), you will get a much bigger zoom in (10x).
  •   Zoom Out. 1). Click the map once to re-center the map and zoom out by a fixed proportion (50%). 2). Drag the mouse to define a rectangle for which you wish to zoom out (smaller scale) a fixed amount at a specific point. If you drag out a big rectangle (i.e., half the size of the map), you will get a 2x zoom out. If you draw out a small rectangle (i.e., 1/10 of the map area), you will get a much bigger zoom out (10x).
  •   Pan. Drag the mouse to move the map in any direction.
  •   Print. Opens a printer-friendly view of the current map with a legend in a new browser window. Select “Print…” from the File menu to select a local printer from the dialog box. Selecting "Landscape" orientation will give optimal output.

Zoom To
To zoom directly to a jurisdiction or place of interest, select a category and an area and click the Refresh Map button. The list of areas will be refreshed as a category is selected.

Reference Layers

These layers help orient the viewer geographically. Any combination of layers may be active at a given time. Because of their inherent detail and complexity, some reference layers will not display until a scale threshold is gained. For more information, see the Reference Layer section of the Map Layer Notes page.

To toggle the layers, check on or off any of the reference layers and click the Refresh Map button.

Thematic Layers

The following thematic layers: public land ownership, existing land use, and planned land use are the main data layers for the map. The employment lands thematic layer, which shows the status of land designated for industrial development, will be included in a future release of REDI. For more information, see the Thematic Layer section of the Map Layer Notes page.

Any one of these thematic layers may be viewable by clicking the corresponding option under the Thematic Layers section of the Maping tab and clicking the Refresh Map button. When no thematic layer is desired, perhaps to isolate one or more reference layers, the None option may be selected.

Base Map

To change the map to apply different base map layers, select None, Terrain, or Photo as the base map layer and click the Refresh Map button.

Locate Panel

APN

To zoom the map to a specific land parcel in the Region, enter the 10 digit Assessor's Parcel Number (APN) and click the Find button.

Address

To locate an address, enter an address and select a city and click the Find button. To clear the selections, click the Clear Selection button.

Inquiry Panel

This panel provides filter selections to perform data analysis with the Employment or Residential Lands Inventory. Select the Employment Lands or Residential Lands thematic layer from the Mapping tab. Then filter by specific market status, distance to the nearest airport, railroad, acreage, and specific city or plan area. You can check on "Zoom to matches" to zoom to all the maximum extent of parcels that match your filter criteria. Click the "Show report of matches" to view a summary report of the number of sites with the acreage that match the filter criteria.

Report Panel

Parcel Information

To get information about a specific parcel, check on the Parcels reference layer from the Mapping panel, then use the Zoom In tool to zoom to an area. Hint: since the parcels layer only displays at a scale threshold of 1"=24,000 feet, draw out a small rectangle with the Zoom In tool to get a much bigger zoom in (10x). Once the parcels are visible, select the Parcel information report from the Report panel and click any parcel on the map. A separate window will pop up to show a report of parcel information.

Statistical Summary

To get demographic information for an area around any point on the map, select this report option. Then choose a distance to use as a radius. Set the origin for the radial search by clicking on the map. REDI will return a statistical summary for the area within the specified distance in a separate window. You may select an option to have the map either zoom automatically to the area defined or to have the map retain its current extent.

REDI bases its statistical summaries on small geographic areas called SGRAs (SANDAG Geographic Reference Areas). When a radius and a search center are sent to REDI, data are retrieved and tabulated for all SGRA centroids within the search radius. So the methodology is an all-or-nothing approach that does not rely on data proportioning at all. Except in the East County where SGRAs are larger, the small size of SGRAs in the urban areas generally yield reasonable approximations of circular areas.

 

SGRA approximation of a 2 mile radius
around a point in Mid City.

Tips for Using REDI

  • Allow popup blocker for this site.
  • You can refresh the map display at any time by clicking the Refresh Map button on the Map Panel.
  • REDI looks best at and was designed with a video resolution of 1024x768 and 64k color depth.
  • Response times can get lengthy when the photo base and/or parcel layers are on. The best approach is to zoom into your area of interest with no thematic layer selected ("None"), then turn on the theme, photo, parcels, etc.
  • Some reference layers may not display if the current map scale is too small.
  • The "Zoom to" control always takes precedence over the "Zoom In" control.
  • The map on the Mapping, Locate, and Report panels was designed to be interactive; however, the Legend panel displays a static map. Map images may be downloaded by right-clicking on the map in the Legend panel and choosing "Save Picture As..." (Internet Explorer) or "Save Image As..." (Firefox) option. Images may be freely used in any document or publication, but we ask that you attribute maps to SANDAG/SanGIS.

Comments and suggestions regarding the REDI system are welcomed. Email Kristie Lu at klu@sandag.org.