Multihazard and Risk Study for Mount Hood

Study Limitations

We developed the best databases we could, but within our funding and time constraints we were able to develop only those described in Section 6, Definitions. We were not able to compile or develop comprehensive hazard or asset data, so hazards like ash-fall and wildfire and assets like sewer lines and local power lines were not included.

Every effort has been made to ensure the accuracy of the GIS databases, but it is not feasible to completely verify all of the original input data. No budget for field work was included in the project award, so we did very little field checking of hazard or asset data.

The methods followed to create the hazard and asset data ranged significantly in detail, so errors related to the varying detail in methodology are possible. For example, the landslide mapping protocol (Burns and Madin, 2009) has great detail, but we constructed the road bridge database by simply combining an existing database and some ?heads up? digitizing of feature locations from lidar. Also, the methods we followed have limitations described by the author(s) of the original publications.

The mapping is a ?snapshot? view of the current landscape that may change as new information regarding hazards and/or assets becomes available or future (new) hazards occur and/or new assets are built. Some hazards or assets have been mitigated. Because it is not feasible to collect detailed site-specific information on every hazard and asset, mitigation has been omitted; thus, we have assumed the worst case for all hazards and assets.

Again, because of these limitations the data and results of the analysis are intended for regional purposes only and cannot replace site-specific investigations. Please contact DOGAMI if errors and/or omissions are found so that they can be corrected in future versions of this data.

References:

Burns, W.J., and Madin, I.P., 2009, Protocol for inventory mapping of landslide deposits from light detection and ranging (lidar) imagery: Oregon Department of Geology and Mineral Industries Special Paper 42, 30 p.

Map Viewer Data Limitations

The Hazards and Assets Map Viewer web map application displays the study data in an accessible way for the public. Although the data have been processed successfully on a computer system at the Oregon Department of Geology and Mineral Industries (DOGAMI), no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. This disclaimer applies both to individual use of the data and aggregate use with other data. We also urge you to pay careful attention to the Study Limitations associated with these data. The Oregon Department of Geology and Mineral Industries shall not be held liable for improper or incorrect use of the data described and/or contained herein. Data are not intended for site-specific investigations

DOGAMIreserves the right to update data on this web site without notification as new information becomes available.

Users should use caution when overlaying other data sets and should not make legally binding decisions from this data. These data are subject to change. Acknowledgment of DOGAMI would be appreciated in products derived from these data. Any person using the information presented here should fully understand the data collection and compilation process before beginning their analysis/use. The burden of determining fitness for use lies with the user.

To avoid the risk of misinterpretation, invalid results, and erroneous conclusions, users must consider original map scale, collection methodology, currency of data, and any other conditions specific to every data element and each dataset as a whole. Potential users are advised to consult with DOGAMI to gain an understanding of the inherent limitations of this data set and its scope of inference. Also, the user must be aware that errors and conditions originating from physical sources involved in developing a dataset may be reflected in the data and that the digital processing performed during preparation, storage, and transmission of the dataset may have exacerbated such errors and/or introduced additional ones.