Alaska Spatial Data Management System (SDMS)
Welcome to the Bureau of Land Management's Spatial Data Management System (SDMS) for Alaska. This portal page provides access to online BLM Alaska land record documents, reports, and an interactive web map application.
Alaska Case Reporting Enterprise System (ACRES):
The ACRES reports contain BLM Alaska case information up to October 4, 2024. Reports include native, state and private land conveyance cases, as well as leases, permits, federal mining claims, easements and more.
Access the Alaska Case Reporting Enterprise System (ACRES)
As of October 15, 2024: ACRES has been migrated to the Mineral & Land Records System (MLRS). Access MLRS reports to obtain the most recent BLM Alaska case information.
The Lands, Minerals, and Realty (LMaR) interactive map:
The Lands, Minerals, and Realty interactive map provides access to multiple geospatial layers including: mining claims, mining plans, conveyed lands, selected lands, withdrawals, easements and more. Layers within the map provide direct hyperlinks to case information, master title plats, historical indexes, survey information, and mining information.
View the Lands, Minerals, and Realty (LMaR) Interactive Map
Notice: The Lands, Minerals, and Realty (LMaR) interactive map will remain as a reference option for both BLM staff and customers following the newest Mineral & Land Records System (MLRS) module released October 15, 2024. For additional reference, to perform mineral and land records research, and view case details, access the MLRS interactive map at https://mlrs.blm.gov/s/research-map.
Document Databases
The following databases will eventually be migrated to the BLM General Land Office Records system.
Conveyance Documents: Scanned images of BLM Alaska land conveyance documents including: Patents, Tentative Agreements and Interim Conveyances issued since 1965.
Search Alaska Conveyance Documents
Master Title Plats: Scanned images of BLM Alaska MTPs. These maps portray the Bureau's record of current federal land ownership and land status.
Search Alaska Master Title Plats
Survey Plats: Scanned images of Alaska Cadastral land survey plats and field notes.
ANCSA 17(b) Easement Maps: Scanned images of federal easements across native lands, presented on USGS quadrangles.
Search Alaska ANCSA 17(b) Easement Maps
Alaska Public Laws, Orders and Directives Online: Scanned images of federal Alaska Public Laws, Orders and Directives.
View Alaska Public Laws, Orders and Directives Online
Please note that the on-line data and documents available through this site do not constitute nor replace official legal records, documents or case files. Refer to specific records on file at BLM for official record information
Frequently Asked Questions for troubleshooting SDMS databases and products
- Do I need any special software to use SDMS?
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A web browser. SDMS has been tested with Firefox, Internet Explorer 11, Safari, and Chrome web browsers. There are known issues with the new Microsoft Edge Browser that we are working to resolve. Until these issues are resolved, please use one of the supported browsers. If you wish to view the scanned Survey Plats and Notes or Master Title Plats, you must have the DjVu browser plugin installed. The plugin is available free of charge Popups must be enabled for sdms.ak.blm.gov in order for many features of the site to function properly.
- Do I need any special software to use the Land, Minerals, and Realty (LMaR) web map app?
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LMaR is a web map that is hosted on Esri's ArcGIS Online platform. You can access ArcGIS Online through any web browsers or mobile devices.
- How often does the data get updated in SDMS and the Lands, Minerals, and Realty (LMaR) web map app?
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Information and reports accessed through ACRES is updated on a daily basis. Conveyance Documents, Master Title Plats, Survey Plats, ANCSA 17(b) Easement Maps, and Alaska Public Laws, Orders and Directives are updated as new information is added. GIS data displayed on LMaR is updated regularly as needed.
- How can I download the GIS data found in the Lands, Minerals, and Realty (LMaR) web map app?
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Visit BLM Alaska's GIS Data page and download any of the data sets listed there.
- Where do I find more information on how to use Esri's ArcGIS Online platform, the software hosting the Lands, Minerals, and Realty (LMaR) web map app?
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ARCGIS Help has helpful instructions for users of LMaR. While using LMaR, specific instructions for doing some of the common tasks can be found by clicking the Help widget.
- How do I retrieve land status information by township?
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There are two ways to retrieve land information by township. The Township Summary by Case, Township Summary by Land, and the Mining Claim Summary reports allow land status retrieval by a township description down to the section, as well as optionally specifying a case type and/or a case status. The same reports can also be accessed spatially from the Lands, Minerals, and Realty (LMaR) web map application by zooming to the desired township and selecting the township with the cursor. Hyperlinks are provided.
- Where can we find tools for locating information regarding surveys?
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In the past, tools were created to query survey data. With new technology, many of these queries are now available in the Lands, Mineral and Realty web map application Lands, Minerals, and Realty (LMaR). In the web map app, ensure that the Surveyed Land layers is turned on, zoom to the area of interest and click to view attributes and hyper links.