The default tool is the "Zoom In" tool, so you can immediately start using the map just by using your mouse to draw a box around the area of the map you want to view or by clicking once on a spot on the map. When you change any layer options , the map redraws automatically.

To display information for the area you are viewing, click on the Map Info and Key tabs.

Read the rest of this Help page to learn more about how to interact with the map.

Use the Layers tab options to select the data layers to display on the map. When you select a layer the map automatically updates. Some users with slower connections may need to wait for layer display to "catch up."

BASE MAP:

You can view and compare the following kinds of imagery:

• Topographic Map (DRG): composite of scanned images of 1:24,000 scale USGS standard topographic map series (digital raster graphics, DRG) of the area. Due to image quality this layer is visible only at scales from 1:50,000 to 1:24,000.
• 50m Hillshade: this data has been reprocessed from 30 meter DEMs (digital elevation model data). Due to image quality this layer is visible only at scales from 1:1,500,000 to 1:50,000.
• LandSat NED: Tri-Decadal Global Landsat Orthorectified image of Oregon. Due to image quality this layer is visible only at scales from full scale to 1:80,000.
• USGS 7.5' Quad Outlines: U.S. Geological Survey 7.5 minute topographic quadrangle series coverage for Oregon. Quadrangle outlines are visible at all scales; for readability, quadrangle labels are visible only at scales from 1:250,000 to 1:24,000.

Turning base imagery layers on and off allows you to compare the relative accuracy of various forms of imagery. For more information, read the Background, Metadata, and Disclaimer pages.

CULTURAL FEATURES AND BOUNDARIES:

Display optional overlays of:

• County Boundaries: Oregon county boundaries and is visible at all scales. Uncheck the box hide this layer.
• Water Bodies: Vector-based waterbody areas using USGS, 1:2,000,000, data. Uncheck the box hide this layer.
• Towns: The Towns overlay shows city limits. Uncheck the box hide this layer.
• Highways: The Highway overlay layer displays all state owned or maintained highways, connections, frontage roads, temporary traveled routes and located lines. To see all roads at scales of 1:50,000 to 1:24,000, turn on the Topographic Map (DRG) layer).
• Township and Range: Displays boundaries in the township and range system. Symbology is, e.g., T41SR14E, which means Township 41 South, Range 14 East. Township and range outlines are visible at all scales; for readability, Township and Range labels are visible only at scales from 1:100,000 to 1:24,000.
• T & R Sections: Displays sections (each 1 square mile, or 640 acres) in the Township and Range system. Section outlines are visible at scales from 1:250,000 to 1:24,000; for readability, Section labels are visible only at scales from 1:100,000 to 1:24,000.

For more information, read the Background, Metadata, and Disclaimer pages.

SLIDO SOURCE MAPS:

SLIDO Source Maps: Displays the outlines of the 257 source maps used to compile the SLIDO database. To see the Reference ID for a source map, zoom in to at least 1:1,000,000, then click the Info Query tool anywhere within a source map outline. The Query Results tab lists all source map Reference Code IDs and the original map scale associated with that Reference. Note that WalkGW2002 always appears because that source map covers the entire state. For full reference citations, see the Background page, Source Data section.

For more information, read the Background, Metadata, and Disclaimer pages.

INVENTORY TYPE: Displays SLIDO and DOGAMI Special Paper 34 landslide data.

	SLIDO Version 1: Landslide polygons, categorized by type. The color in the legend is more saturated than the color in the map because the map layer is semi-transparent.
	Special Paper 34: Polygon, line, and pint data compiled for DOGAMI Special Paper 34. The color in the legend is more saturated than the color in the map because the map layer is semi-transparent.

For more information, read the Background, Metadata, and Disclaimer pages.

Click on the Tools tab to navigate the map and see information about specific points in the map. When you click on a tool, text appears below to tool to tell you how to use the tool and to remind you which tool is active. It is important to train yourself to look at the current tool before clicking on the map -- you will save yourself lots of frustration if you keep in mind which tool is currently selected.

Zoom In - With the Zoom In tool selected, click on the map to zoom in and reset the map on the spot where you clicked. To more precisely define the area you want, click and drag (press down the mouse button and hold it down while you drag the mouse) to create an outline of the area you want to see. You can zoom anywhere from 1:517,000 to 1:2,400 scale.

Zoom Out - With the Zoom Out tool selected, click a spot on the map to zoom out and recenter the map on the spot you clicked.

Zoom To Full Map - With the Zoom to Full Extent tool selected, click anywhere on the map. The full map will display.

Zoom To... - Use this tool to zoom to a scale. Type a number in the Scale field, then click the "Find" button or press the Return key on your keyboard. Do not put commas in the number. The minimum scale is 1:24,000; the maximum scale is 1:3,279,581.

Pan - move around the entire map. Press down the mouse button and hold it down while you move the cursor up, down, right, or left. The location map shows where you are.

Zoom To Scale - Click on a number button to zoom to a preset scale:

Info Query - With this tool selected, click anywhere on the map to display, by means of the Query Results tab, geothermal and location information specific to that spot. To close the tab, click at the top of the tab title area.

Download Map Image - Click on "Download Map Image" tool to save a Portable Networks Graphic (.png) formatted file of the current map display that you can print if you have a printer. You can then open the .png file and print it from your browser window or from other applications that can open .png files.

Select the image size and image resolution from the options, then click the "Create Printable Image File" button. A dialog box appears. Choose the application you want to use to open the .png file immediately or choose to save the .png file to your default location for downloaded files.

A red box on the small outline map of the area shows the extent of the large map area. For very small areas the red box changes to a crosshair. You cannot click in the location map to change the large map.

The scale bar provides an approximate scale in miles for the map. To see the map scale, click on the "Location Info" at the bottom left of the map area.

Location Info - Click on the LocationInfo tab in the bottom left of the map area to display the map projection system and the current scale. To close the tab, click in the tab title area.

Key Tab - Click on the Location Info tab in the bottom left of the map for help understanding the symbology on the map. To close the tab, click on the tab title area. Note that because the inventory polygons, lines, and points are somewhat transparent on the map, their colors appear darker in the Key.

Info Query - With the Info Query tool selected, you can click anywhere on the map to view landslide-related information specific to that spot. The information changes depending on which landslide layers are selected. If there is a lot of information for the point you clicked on, you may need to use the scroll bar on the right side of the Query Results tab window to see all the geothermal data. The "Reference ID" refers to the original source data. To close the Query Results tab, click on the tab title area.

SLIDO Landslide Inventory:
General Landslide Type: A generalized field created to distinguish between three different types of landslide deposits: 1) landslide or landslide topography, 2) debris flow or other fan, and 3) talus or colluvium.
Reference ID Code: The reference identification code is the shortened code of the full reference to the original study map. The reference identification code is a text field that identifies the reference author by the first four letters of the last name, followed by the first and middle initials, followed by the publication year of work or the unpublished status, followed by the plate information (if any). Full references are provided on the Background page in the Source Data section.
Unique ID: This is the Reference ID Code plus a number that identifies a particular polygon from all the polygons identified in each study. This results in a unique ID for each polygon.
Original Map Unit Label: The original label given by the reference author on the original map. There are roughly 160 different map unit labels ranging from very generalized labels like "Qls" (Quaternary landslide) to more detailed labels like "Active Landslide-Slump."
Landslide Area (square ft): Estimated volume of slide material in square feet.

DOGAMI Special Paper 34:
Unique ID: Unique identifier for each entry.
Type: The type of GIS object used to represent the entry (either polygon, line, or point).
County: County name within which the centroid of the entry is located. Based on a GIS overlay with an approximately 1:100,000-scale Oregon County polygon layer ["County.e00" obtained from the Oregon Geospatial Data Clearinghouse (http://www.sscgis.state.or.us/data/themes.html)]. For the 53 entries across the border into California, the COUNTY designation is "CA," and for the 30 entries in Washington, the COUNTY designation is "WA."
Watershed: Designation of fifth-field watershed within which the centroid of the entry is located. Based on GIS overlays with the approximately 1:24,000-scale polygon coverages “westwbnd.shp” for the western portion of the state and “orwater.shp” for the east. The "orwater.shp" coverage was used only in areas outside the “westwbnd. shp” coverage. Both data sets were obtained from the Oregon Geospatial Data Clearinghouse (http://www.sscgis.state.or.us/data/themes.html). For the 30 entries in Washington, the WATERSHED designation is "WA." The 84 entries in eastern Oregon do not have an assigned WATERSHED; these entries are designated as "N/A" for “Not Applicable.”
Source Organization: The organization (company/agency) from which the entry information was obtained.
Failure Date: Date(s) of slide activity.
Length (ft): Estimated length of the slide in units of feet.
Width (ft): Estimated width of the slide in units of feet.
Depth (ft): Estimated depth of the slide in units of feet.
Volume (cubic ft): Estimated volume of slide material in cubic feet.
Type Material: Predominate type of landslide material (rock, earth, debris, fill, other), following the nomenclature
of Cruden and Varnes (1996).
Type Movement: Predominate type of movement exhibited by the slide mass (fall/topple, flow, translational slide,
rotational slide, spread, other), following the nomenclature of Cruden and Varnes (1996).
Slope (degrees): Estimated slope angle recorded in units of degrees.
Contributing Factors: Noted factors contributing to the failure.

Cruden, D. M., and Varnes, D. J., 1996, Landslide types and processes, in Turner, A.K., and Schuster, R.L., eds., Landslides: Investigation and mitigation: Washington, D.C. National Academy Press, Transportation Research Board, National Research Council, Special Report 247, p. 36–75.

SLIDO Source Maps:
Reference ID Code: Same as the SLIDO Landslide Inventory field above. All maps that cover the area are listed. Note that WalkGW2002 always appears because that source map covers the entire state. For full reference citations, see the Background page, Source Data section.
Original Map Scale: The scale or ratio at which the original mapping was performed.

"Why doesn't the map appear in my browser?"
If the map doesn't display, make sure your browser is JavaScript enabled and, if you are using Internet Explorer, Active X controls are allowed. The map interface has not been tested on all browsers but should work on the most popular browsers.

"How do I zoom to a particular scale?"
Use the "Zoom To" tool or the "Zoom To Address/Scale" tool. See the Help - Tools Tab section.

"How do I save or print a map image?"
Use the "Download Map Image" tool to save and print the currently displayed map image.

"Why doesn't the screen update when I click layers on and off?"
The map contains a lot of data. Sometimes the display needs time to "catch up" to the clicks. If the map will not refresh properly, try resetting the map (click the Reset button in the Tools tab), or refreshing the page, or closing the browser window and then opening the map page again.