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Map Viewer Help

Read this page if you have trouble navigating or understanding the map interface.

Note: To view the map, your browser must have Adobe Flash Player and must allow cookies. The map will run on the Macintosh operating system, but users of Apple iOS devices (iPhone, iPod Touch, iPad) will need to obtain a Flash-enabled, third-party browser such as Skyfire or Puffin. Note that DOGAMI does not endorse any particular third-party software.

SLIDO interface

Pan and Zoom Controls
Map Contents (Data Layers Legend)
Tool Bar Options:
   Map Contents and Layers Currently Shown
   Measure
   Print
   Find an Address
Scale Bar and Latitude/Longitude
Base Map Options
Overview Map

FAQs
"Why doesn't the map appear in my browser?"
"How do I zoom to a particular scale?"
"How do I save or print a map image?"
"Why doesn't the screen update when I click layers on and off?"

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Pan and Zoom Controls

Pan and Zoom control

Pan and Zoom controls allow you to navigate around the map. The viewer opens at 1:9,244,649 scale. You can zoom in to 1:9,028 scale.

Besides panning north, south, east, and west you can pan NE, NW, SE, SW by clicking between the N, S, E, and W arrows.

Zoom scales for this map are:

  • 1:9,028
  • 1:18,056
  • 1:36,112
  • 1:72,224
  • 1:144,448
  • 1:228,895
  • 1:577,791
  • 1:1,155,581
  • 1:2,311,162
  • 1:4,622,324

 

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Map Contents (Data Layers Legend)

Highlighted Layers tab

Use the Map Contents window to select the data layers to display on the map. Click on the plus sign to the left of the layer to expand that layer. Click on the minus sign to collapse a layer. Use the scroll bar at the bottom of the column to see the full layer name. Click and drag the bottom right corner of the window to resize it. To see a layer or sublayer, make sure the check box to the left of the layer name is checked. When you select or modify a layer the map automatically updates. Some users with slower connections may need to wait for layer display to "catch up."

Not all layers are visible at all scales; if the layer is grayed out, the data are not visible at that scale.

 

Highlighted Layers tab

The down-pointing arrow to the right of a layer provides access to options for the layer or a short description of the layer. If you do not see the down-pointing arrow, expand the Map Contents window by dragging the lower right corner of the window to make the window wider. Not all layers have additional options.

Zoom to: Click this option to zoom to the full extent of the data on this layer.

Transparency: Set the transparency of this data layer by holding down the cursor on the black dot on the slider bar and dragging to the desired transparency.

Move up/down: Click this option to move the current layer up or down in the stack of layers.

Expand All Layers: Click this option to expand all the layers in the Map Contents window. Clicking this option does not turn on all sublayers. Click the checkbox next to a data type to make it visible.

Collapse All Layers: Click this option to collapse all the layers in the map Contents. Clicking this option does not turn off all the sublayers.

Zoom to: If a layer is grayed out, the data are not visible at the current scale. Click the Zoom to Make Visible option to zoom in to the first scale at which the layer data are visible.

Description: Click on the Description option to see a quick definition for the layer data. Click the X in the top right corner to close the description.

Open:

Close:

 

   


HISTORIC LANDSLIDE DATA INVENTORY:

Inventory of Historically Active Landslides (1932-2010). This layer shows center points of published or known historical in landslides in Oregon.

data fields for historic landslide points

Click on a landslide point to see information for that point. The selected point is highlighted on the map. Use the scroll bar on the popup to see all the fields. Click on the Zoom To button to recenter the map on the point.

Information shown for Historic Landslide Data layer point features.
Reference ID Code
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.
Data Source
The organization (company/agency) from which the entry information was obtained.
Data Location Method
Indication of how the location data were incorporated into the consolidated database and original
methods of mapping (e.g., from aerial photographs, field investigations, etc.).
Unique ID from Original Study
Unique identifier used in original study.
Landslide Name
Name associated with the slide or activity.
Date
Date(s) of slide activity.
Length in Feet
Estimated length of the slide in feet.
Width in Feet
Estimated width of the slide in feet.
Depth in Feet
Estimated depth of the slide in feet.
Slope in Degrees
Adjacent slope angle.
Type of Movement
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.
Movement Class
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 [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].
Factors Contributing to Slide
Noted factors contributing to the failure.
Material Type
Predominate type of landslide material (rock, earth, debris, fill, other), following the nomenclature
of Cruden and Varnes (1996). [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].
Area, feet squared
Estimated area of slide material in square feet.
Volume, feet cubed
Estimated volume of slide material in cubic feet.
Deep or Shallow Seated
Deep or shallow seated landslide; 4.5 m (15 ft) is the boundary value.
Damage
Account of damage associated with the slope failure.
Losses
Estimated or actual losses associated with activity, provided by original mapper.
Comments on Damage
Any notes provided by original mapper.
Annual Cost
Estimated or actual annual cost associated with activity, provided by original mapper.
Repair Cost
Estimated or actual repair cost associated with activity, provided by original mapper.

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


Map Contents - Mapped Landslide Data layer

MAPPED LANDSLIDE DATA INVENTORY:

Shows landslide polygon data. Lidar-derived landslide polygons are outlined with a yellow stroke. The yellow stoke is not visible until you zoom in to at least 1:144,448; at zoom levels less than that the layer entry is grayed out and the yellow strokes that identify a polygon mapped using a lidar base are not visible.

North of Thurston.
Deposits (non-lidar derived) layer on.
Lidar-derived Deposits layer on. Lidar-based mapping allows for much more accurate definition of landslide features. Both Deposits and Lidar-derived Deposits layers on.

Scarp: concave, steep areas of a slope where material has been removed due to landsliding.

Talus-Colluvium: loose sediments built up at the base of a slope due to transportation by gravity.

Fan: an outspread mass of material, usually at the base of a narrow channel, deposited by a landslide.

Landslide: deposits of material that have been moved by landsliding.

Head Scarp: area at the top of a slope where material has been removed due to landsliding.

Information shown for Mapped Landslide Data layer polygon features. The selected feature is also highlighted on the map. If there are multiple features at that location, all features are listed; use the arrows at the top left of the popup box to see the data for each polygon. The current polygon is outlined in blue.

arrow to see multiple polygons

Click on the Zoom To button to recenter the map on the polygon.

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.
Reference ID Code
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.
Reference
The full reference for the original study.
Type of Movement
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.
Movement Class
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 [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].
Movement Code
DS-R Debris Slide - Rotational
DS-T Debris Slide - Translational
ES-R Earth Slide - Rotational
ES-T Earth Slide - Translational
RS-R Rock Slide - Rotational
RS-T Rock Slide - Translational
DFL Debris Flow
EFL Earth Flow
RFL Rock Flow
DSP Debris Spread
RSP Rock Spread
RSP Rock Spread
DF Debris Fall
RF Rock Fall
RF Rock Fall
DT Debris Topple
ET Earth Topple
RT Rock Topple
C Complex
ES-R>EFL Complex Earth Slide - Rotational & Earth Flow
Confidence
Confidence of identification: High (greater than or equal to 30); Moderate (11-29); Low (less than or equal to 20).
Age
Estimated age of slide activity: Historic (<150 years); Pre-Historic (>150 years).
Date Movement
Date of last known movement or movements; format mm/dd/yyyy.
Name
Name of slide or event.
Geology
Geologic unit from Special Paper 42.
Slope
Adjacent slope angle.
Head Scarp Height
Change in elevation from bottom to top of head scarp.
Fan Height
Change in elevation from top to toe of fan.
Failure Depth
Estimated and/or calculated slope-normal thickness of failure depth.
Deep or Shallow Seated
Deep or shallow seated landslide; 4.5 m (15 ft) is the boundary value.
Head Scarp to Internal Scarp 1
Horizontal distance in feet from head scarp to internal scarp no. 1.
Internal Scarp 1 to Internal Scarp 2
Horizontal distance in feet from internal scarp 1 to internal scarp no. 2.
Internal Scarp 2 to Internal Scarp 3
Horizontal distance in feet from internal scarp 2 to internal scarp no. 3.
Average Horizontal Distance
Calculated average horizontal distance between scarps. Units: feet.
Direction
Direction of movement, in increments of 22.5 degrees:
0, 22.5, 45, 76.5, 90, 112.5, 135, 157.5, 180 ,202.5, 225, 247.5, 270, 292.5, 315, 337.5, 360.
Area
Estimated area of slide material in square feet.
Volume
Estimated volume of slide material in cubic feet.
Quadrangle Name
U.S. Geological Survey topographic map name.
Map Unit Label
The geologic map unit associated with the original mapping.
Description
Generalized landslide type: landslide, fan, or talus-colluvium.
Scale
The scale or ratio at which the original mapping was performed.

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

   

Map Contents - Source map details

SOURCE MAP DETAILS:

Shows the scale of the original mapping; if the map base is lidar-derived imagery (scale 1:8,000); and if the intent of the original mapping was for geologic hazard specific study. Scale and study intent can affect how carefully the landslides in the original study were mapped.

Map Content - Source Map extents

You can change the transparency of the layers by clicking on the arrow to the right of the Source Map Details layer name.

To see which source maps are being used at a point, make sure the Source Map Details layer is on and then click a point on the map. A popup showing the underlying source map(s) displays. The REF_ID-COD corresponds to the source publications listed on the Background page.

source map ID

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Tool Bar Options


address search tool

Use the Tool buttons to turn on and off specific data layers on the map, see what layers are currently visible on the map, print the currently displayed map, measure features on the map and search for addresses. When a tool is active, the icon has a line below it to show it is active.

Close a tool window popup by clicking on the X in the upper right-hand corner. Collapse a tool window by clicking on the line to the left of the X. Expand the tool by double-clicking on the tool icon in the collapsed tool window.


layers currently shown icon'

Map Contents - Displays all the possible data layers for the map. See Map Contents (Data Layers Legend) section.

Layers Currently Shown - Shows only the layers currently being displayed

Both the "Map Contents" and the "Layers Currently Shown" windows display information about data layers. You can change which layers to display by using the "Map Contents" window. The "Layers Currently Shown" window shows only the layers being displayed, so it acts like a legend for the current mapview; you may find this more convenient than scrolling through the Map Contents window.

Both windows are open by default when you open the viewer. Choose layers to display by checking boxes to the left of the layers in the Map Contents window. To expand a layer, click on the plus sign to the left of the layer. All sublayer choices for a layer appear when the layer is expanded. To display a sublayer layer on the map, make sure both the sublayer AND its group layer are checked on.

  • Move the legend window around the screen by left-clicking and holding down the mouse, then moving the cursor to reposition the legend box.
  • Resize the window by positioning the cursor in the lower right corner of the legend box until the double-arrow cursor appears. Then left-click and hold down the mouse while dragging the cursor.
  • Close the window by clicking the "X" in the upper right corner of the box.
  • Minimize the window by clicking in the horizontal bar in the upper right corner of the box.
  • Collapse a single layer by clicking on the plus sign to the left of the layer.
Show/hide the symbol for a sublayer in the legend by clicking on the plus/minus sign to the left of the sublayer.

Info Query tool icon

Measure - Use this tool set to draw and symbolize your own points, lines, and polygons on the map interface. Optionally, you can show measurement values and tooltips to help you as you draw. Select the drawing tool you want to use - line, rectangle or polygon. Before you start drawing, select fill color, fill style, alpha (transparency; 1 is opaque; 0.5 is 50% transparent), outline color and stroke weight, and units for measurements if you choose to display measurements. Click on a point or use the mouse to draw a line or shape.

.

using the SLIDO measure tool

You can draw as many features as you like. Drawings are cumulative until you click the "Clear drawings" text, even if you close the Draw and Measure toolbox. If your drawing and text appear on current extent of the map, they will be part of any print file you make. You cannot save your own measurements from session to session. To delete measurement graphics, click on "Clear Measurements".


SLIDO print icon

Print Your Map: Print the current extent of the map. Clicking the icon causes a popup box to appear. Optionally, enter a name and subtitle for your map view, then click the "Print " button to display a Print dialog box. Choose printer settings as you normally would for your printer setup but with "landscape" orientation.

address search tool

Enter an address and zoom to it: Use this tool to zoom to a location by entering a street address, including city and "OR" or "Oregon". You can also enter the city and state, such as "Bend, Oregon". A list will display that shows possible address matches. Select the one you want.

In the example below, the user has entered "100 Main St., Portland, OR" in the Address field and then selected 100 SE Main St. from the list of possible addresses.

 address locator popup 1  

address locator popup 2

The map recenters to the selected address and displays a popup pointing to the address.

multiple search results


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Scale Bar and Latitude/Longitude

scale bar

The scale bar provides an approximate scale in miles for the map. To change the scale, use the Pan and Zoom controls.

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Base Map Options

There are nine base map options. All basemaps can be selected at all scales but will not necessarily show data at each scale. The Topographic base is the default. The selected basemap is outlined with a black box. Use the scroll bar to see all the base maps.

The images below show the same area using each of the base maps. These map services can help you look at the data in different ways. For example:

  • Light Gray Canvas (default): The Esri "Light Gray Canvas" map service focuses attention on the data layers by providing a neutral background with minimal colors, labels, and features.
    Data Source
  • Topographic: The "National Geographic World Map" service provides a a map that shows the topography of the land (without contours). It can help you see the hazard data on slopes and channels.
    Data Source
  • DOGAMI Lidar: The "DOGAMI Lidar" map service is based on a remote sensing technique similar to radar that uses light pulses instead of radio waves. Lidar is typically “flown” or collected from planes and rapidly produces a large collection of very dense and accurate elevation points (up to 500,000 per second) over a large area. As lidar imagery becomes available, it is added to this service. Where available, lidar imagery replaces "Topographic" base map imagery.
    Data Source
  • Imagery: The "World Imagery" map service provides satellite imagery that is the most photograph-like of the basemap options. It can help you see the hazard data on top of "real-world" features.
    Data Source

Other base maps to choose from:

FEMA Coos basemap aerial
Esri Topographic base map
FEMA Coos County Streets basmap
Esri Imagery base map
FEMA Coos County basemap topo

DOGAMI Lidar base map - Lidar-based mapping allows for much more accurate definition of landslide features. Complete statewide lidar coverage is not available yet.

To see lidar coverage for the state or purchase lidar data, use the DOGAMI Lidar Data Viewer.


Example: Lidar-derived landslides layer turned on over lidar base map.

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Overview Map

example Location Map with red box highlighting the current map extent

A red box on the small overview map in the lower right corner shows the extent of the large map area. You can click-and-drag in the overview map area to change the focus of the large map. Click on the small arrow on the overview map to hide the overview map.

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FAQs - Frequently Asked Questions

"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?"
You cannot zoom to a particular scale. Use the scale tool to zoom to predetermined scales.


"How do I save or print a map image?"
Use the "Print" tool to view the currently displayed map image in a new browser window. You can save the currently displayed map extent.


"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 area), or refreshing the page, or closing the browser window and then opening the map page again.