Bm Topographic Map

[Tordis Hurrle]

1The Historical Topographic Map Collection (HTMC) is the set of scanned images of USGS topographic quadrangle maps originally published as paper documents in the period 1884-2006. Visit Historical Topographic Maps - Preserving the Past for more information.

2. US Topo is the current USGS topographic map series for the Nation. These are modeled on the legacy 7.5-minute maps, but are mass-produced from GIS databases of The National Map and published as digital documents. Please visit US Topo: Maps for America for full details.

US Topo map production is transitioning away from a static 3-year refresh cycle. Nevertheless, maps will continue to be updated and published annually. Areas experiencing significant change since the last published map will be reproduced.

Click here see the most up-to-date US Topo production schedule.

Thank you for your patience as we make this adjustment to better meet the needs of our users. More information will be shared as we finalize our new production cycles. Want the best available National Map data on a custom, on-demand, USGS topographic map?

Click here to learn about topoBuilder and OnDemand Topos.

3. OnDemand Topos are USGS-style topographic maps created using the topoBuilder application. These maps are generated upon request using the best available data from The National Map and offer customizations such as choice of format, area of interest, and National Map content. Learn more at the topoBuilder landing page.

The newest USGS topo map web app gives the public the opportunity to create custom topographic maps on demand. The online application is called topoBuilder and the output maps are known as OnDemand Topos.

topoBuilder is a public web application released by the National Geospatial Program that enables users to request customized USGS-style topographic maps, known as an OnDemand Topo, that utilize the best available data from The National Map.

Historically, USGS topographic maps were made using data from primary sources including direct field observations. Those maps were compiled, drawn, and edited by hand. By today's standards, those traditional methods are very expensive and time-consuming, and the USGS no longer has funding to make maps that way. A new USGS topographic map series was launched in 2009 and branded " US Topo ." Though...

If you want to perform differential inferferometry (phase changes between two images) you usually remove the contribution of the topography to the phase. so you get the real phase difference between your images.

I can tell you the steps but you will have to read a bit to understand what is going on there and how the parameters and scene characteristics influence your results. ESA has compiled very good documents for this: _Us/ESA_Publications/InSAR_Principles_Guidelines_for_SAR_Interferometry_Processing_and_Interpretation_br_ESA_TM-19

This is also a nice tutorial but it refers to an old version of SNAP and many things changed in the meanwhile: _deformation

@ABraun I understand interferometry well and have been in the industry for many years, however, I have been working with SNAP for maybe 2 years processing Sentinel data. It is different from other software I have used before, Sentinel data is also different, and I am trying to get the order of operations straight. I see that there are 2 ways to remove the topography or subtract the topographic phase.

Someone else said that you can either check the box or run the topographic phase removal separately and get the same results. I would like to know if that is actually true. When I have some time, I will do my own comparison, but can you confirm if that is true or not based off your own experience?

Get your topographic maps here! The latest version of topoView includes both current and historical maps and is full of enhancements based on hundreds of your comments and suggestions. Let us know how we can continue to improve access to the USGS topographic map collection.

This interface was created by the National Geologic Map Database project (NGMDB), in support of the topographic mapping program, managed by the USGS National Geospatial Program (NGP). Geologic and topographic mapping have a long tradition together (see 1888 report). The NGMDB project is proud to assist the NGP in bringing these maps to the Web.

US Topo Series added to topoView

We've added the US Topo series to topoView, giving users access to over 3 million downloadable files from 2009 to the present day. The US Topo series is a latest generation of topographic maps modeled on the USGS historical 7.5-minute series (created from 1947-1992). Like the historical topographic mapping collection, we've added a variety of file formats previously unavailable for the US Topo series, including GeoTIFF and KMZ.

New functionality driven by your feedback

The latest version of topoView is full of enhancements based on hundreds of your comments and suggestions. We've added the ability to preview maps within the interface and give you tools to compare any historical map with maps of the present. Filters and searches work seamlessly with the map records table to get you the info you need with fewer clicks. Accessing the information you need is easier and quicker than ever. As always, your feedback is important to us so don't hesitate to let us know what you'd like to see in future releases!

Note: New with LF 2020, topographic products are consistently calculated from true north, a correction from earlier topographic products where Aspect was calculated incorrectly. Users are advised to download the new LF 2020 topographic products for CONUS, HI, AK, and PRVI to replace any LF topographic products previously downloaded. We also advise that LCP files created from earlier topographic products be re-created using the new LF 2020 topographic products.

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Purpose: To identify disease activity and effects of intravitreal pegcetacoplan treatment on the topographic progression of geographic atrophy (GA) secondary to age-related macular degeneration quantified in spectral-domain OCT (SD-OCT) by automated deep learning assessment.

Methods: Retinal pigment epithelium loss, photoreceptor (PR) integrity, and hyperreflective foci (HRF) were automatically segmented using validated deep learning algorithms. Local progression rate (LPR) was determined from a growth model measuring the local expansion of GA margins between baseline and 1 year. For each individual margin point, the eccentricity to the foveal center, the progression direction, mean PR thickness, and HRF concentration in the junctional zone were computed. Mean LPR in disease activity and treatment effect conditioned on these properties were estimated by spatial generalized additive mixed-effect models.

Conclusions: Assessing GA progression on a topographic level is essential to capture the pathognomonic heterogeneity in individual lesion growth and therapeutic response. Pegcetacoplan-treated eyes showed a significantly slower GA lesion progression rate compared with sham, and an even slower growth rate toward the fovea. This study may help to identify patient cohorts with faster progressing lesions, in which pegcetacoplan treatment would be particularly beneficial. Automated artificial intelligence-based tools will provide reliable guidance for the management of GA in clinical practice.

In modern mapping, a topographic map or topographic sheet is a type of map characterized by large-scale detail and quantitative representation of relief features, usually using contour lines (connecting points of equal elevation), but historically using a variety of methods. Traditional definitions require a topographic map to show both natural and artificial features.[1] A topographic survey is typically based upon a systematic observation and published as a map series, made up of two or more map sheets that combine to form the whole map. A topographic map series uses a common specification that includes the range of cartographic symbols employed, as well as a standard geodetic framework that defines the map projection, coordinate system, ellipsoid and geodetic datum. Official topographic maps also adopt a national grid referencing system.

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