نتایج جستجو برای: usgs

تعداد نتایج: 1257  

2017
Samsuzana Abd Aziz Brian L. Steward Amy L. Kaleita Manoj Karkee

The slope length and steepness (LS) factor is one of the factors in the Revised Universal Soil Loss Equation (RUSLE) needed to estimate average annual erosion rate. The LS factor is often derived from digital elevation models (DEM). DEM errors and uncertainty could affect LS factor estimation and consequently erosion rate estimation. However, DEM uncertainties are not always accounted for, and ...

2004
Jaswinder Singh

In continuation of the efforts made by the Illinois State Water Survey to develop a detailed hydrologic and water quality simulation model of the entire Illinois River Basin, a hydrologic simulation model was developed for the Vermilion River Watershed (one of the major tributaries of the Illinois River) to simulate streamflows using available climatic data. The model was developed using Hydrol...

2005
J. D. Nichols D. I. MacKenzie James D. Nichols

James D. Nichols, USGS Patuxent Wildlife Research Center, 11510 American Holly Drive, Laurel, MD 20708–4017, U.S.A. E–mail: jim_nichols@usgs.gov Darryl I. MacKenzie, Proteus Research & Consulting Ltd., PO Box 5193, Dunedin, New Zealand. E– mail: darryl@proteus.co.nz Nichols, J. D. & MacKenzie, D. I., 2004. Abundance estimation and Conservation Biology. Animal Biodiversity and Conservation, 27.1...

2009
A. McEwen L. Keszthelyi J. Spencer N. Thomas T. Johnson P. Wurz K.-H. Glassmeier C. Shinohara T. Girard G. Heinsohn R. Furfaro T. Gardner D. Cheeseman R. Beatty J. Ludwinski T. Kowalkowski C. Yen T. Elliott E. Turtle K. Strohbehn C. Falco R. Evans

tensen, P. Wurz, K.-H. Glassmeier, C. Shinohara, T. Girard, G. Heinsohn, R. Furfaro, T. Gardner, D. Cheeseman, R. Beatty, J. Ludwinski, T. Kowalkowski, C. Yen, T. Elliott, E. Turtle, K. Strohbehn, J. Janesick, C. Falco, R. Evans University of Arizona (Tucson, mcewen@lpl.arizona.edu), USGS, SwRI/Boulder, U. Bern, JPL, ASU, IGEP, Microsat Systems Inc., Raytheon MS, APL, Sarnoff Corp., Gibble Corp.

1998
Larry Moore

A common question about U.S. Geological Survey (USGS) digital raster graphics (DRG) is “how can I remove the map collars and join multiple quadrangles together?” The question does not have a simple answer because of the characteristics of USGS quadrangles. Quadrangle neatlines are defined by lines of latitude and longitude, so quadrangles are not rectangles on their published projections. But d...

2012
James R. Irons John L. Dwyer Julia A. Barsi

a r t i c l e i n f o Geological Survey (USGS) are developing the successor mission to Landsat 7 that is currently known as the Landsat Data Continuity Mission (LDCM). NASA is responsible for building and launching the LDCM satellite observatory. USGS is building the ground system and will assume responsibility for satellite operations and for collecting, archiving, and distributing data follow...

2008
David J. Cowen Michael Hodgson W. Lynn Shirley Thomas Wallace Timothy White

This paper outlines a procedure for converting the USGS GEODATA Land Use and Land Cover files into polygon and raster formats that are compatible with several widely used software systems. Examples are included for SAS/GRAPH®, GIMMS and MAP. There is also a discussion of an approach to handling the grid format on IBM-PCs and color frame buffer systems.

Journal: :Current Biology 2007
Nigel Williams

A long-term study by the US Geological Survey (USGS) suggests that recent changes in the quality and availability of sea ice in northern Alaska are the most likely explanation for a decrease in female polar bears bringing up cubs on sea ice and an increase in basing themselves on land. Researchers from the USGS used satellite telemetry to evaluate changes in the distribution of female nesting s...

Journal: :Journal of environmental quality 2003
Mark B David Lowell E Gentry Karen M Starks Richard A Cooke

The occurrence of metabolites of many commonly used herbicides in streams has not been studied extensively in tile-drained watersheds. We collected water samples throughout the Upper Embarras River watershed [92% corn, Zea mays L., and soybean, Glycine max (L.) Merr.] in east-central Illinois from March 1999 through September 2000 to study the occurrence of atrazine (2-chloro-4-ethylamino-6-iso...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید

function paginate(evt) { url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term pg=parseInt(evt.target.text) var data={ "year":filter_year, "term":term, "pgn":pg } filtered_res=post_and_fetch(data,url) window.scrollTo(0,0); } function update_search_meta(search_meta) { meta_place=document.getElementById("search_meta_data") term=search_meta.term active_pgn=search_meta.pgn num_res=search_meta.num_res num_pages=search_meta.num_pages year=search_meta.year meta_place.dataset.term=term meta_place.dataset.page=active_pgn meta_place.dataset.num_res=num_res meta_place.dataset.num_pages=num_pages meta_place.dataset.year=year document.getElementById("num_result_place").innerHTML=num_res if (year !== "unfilter"){ document.getElementById("year_filter_label").style="display:inline;" document.getElementById("year_filter_place").innerHTML=year }else { document.getElementById("year_filter_label").style="display:none;" document.getElementById("year_filter_place").innerHTML="" } } function update_pagination() { search_meta_place=document.getElementById('search_meta_data') num_pages=search_meta_place.dataset.num_pages; active_pgn=parseInt(search_meta_place.dataset.page); document.getElementById("pgn-ul").innerHTML=""; pgn_html=""; for (i = 1; i <= num_pages; i++){ if (i===active_pgn){ actv="active" }else {actv=""} pgn_li="
  • " +i+ "
  • "; pgn_html+=pgn_li; } document.getElementById("pgn-ul").innerHTML=pgn_html var pgn_links = document.querySelectorAll('.mypgn'); pgn_links.forEach(function(pgn_link) { pgn_link.addEventListener('click', paginate) }) } function post_and_fetch(data,url) { showLoading() xhr = new XMLHttpRequest(); xhr.open('POST', url, true); xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8'); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { var resp = xhr.responseText; resp_json=JSON.parse(resp) resp_place = document.getElementById("search_result_div") resp_place.innerHTML = resp_json['results'] search_meta = resp_json['meta'] update_search_meta(search_meta) update_pagination() hideLoading() } }; xhr.send(JSON.stringify(data)); } function unfilter() { url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":"unfilter", "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } function deactivate_all_bars(){ var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(bar) { bar.dataset.active = false bar.style = "stroke:#71a3c5;" }) } year_chart.on("created", function() { var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(check) { check.addEventListener('click', checkIndex); }) }); function checkIndex(event) { var yrchart = document.querySelectorAll('.ct-bar'); var year_bar = event.target if (year_bar.dataset.active == "true") { unfilter_res = unfilter() year_bar.dataset.active = false year_bar.style = "stroke:#1d2b3699;" } else { deactivate_all_bars() year_bar.dataset.active = true year_bar.style = "stroke:#e56f6f;" filter_year = chart_data['labels'][Array.from(yrchart).indexOf(year_bar)] url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":filter_year, "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } } function showLoading() { document.getElementById("loading").style.display = "block"; setTimeout(hideLoading, 10000); // 10 seconds } function hideLoading() { document.getElementById("loading").style.display = "none"; } -->