slope
See Also: aspect
[Euclidean geometry] The incline, or steepness, of a surface. Slope can be measured in degrees from horizontal (0-90), or percent slope (which is the rise divided by the run, multiplied by 100).
slope.aspect - Generates raster map layers of slope, aspect, curvatures and partial derivatives from a raster map layer of true elevation values. Aspect is calculated counterclockwise from east.
KEYWORDS
raster
SYNOPSIS
r.slope.aspect ...
To calculate the angle of the slope, divide the elevation change in feet by the distance of the line you drew (after converting it to feet). This is the tangent value for the angle of the slope.
slope: A measure of change in surface value over distance, expressed in degrees or as a percentage. For example, a rise of 2 meters over distance of 100 meters describes a 2% slope.
Slope and aspect calculation
Many physical processes and management objectives are related to slope and aspect. Slope is defined as the (change in elevation / change in planimetric distance).
Slope ~ rate of change of each surface element (1st derivative)
Aspect ~ orientation of each surface element (direction) ...
QGIS Slope Analysis
To start off, we will calculate the Slope of our DEM data. Select Slope from the Analysis drop-down, keep Input Layer set to dem.
Slope effect, a vegetational result of aspect, in evidence in the coastal sage scrub community of southern California's Santa Monica Mtns. The slope on the left side is north-facing, thus moister and dominated by Ceanothus sp..
Slopes and aspects
if the values in a layer are elevations, we can compute the steepness of slopes by looking at the difference between a pixel's value and those of its adjacent neighbors ...
Slope aspect and stream channel coverages were not generalized to maintain the connectivity of the hydrologic network.
- Slope safety in Hong Kong is enhanced by the provision of online slope information to government departments and the public ...
North Slope Borough (Alaska)
NSC
National Space Council (U.S.); National Security Council (U.S.); National Society of Cartographers ...
[edit] Slope definitions
Equivalent to the right-triangle definitions, the trigonometric functions can be defined in terms of the rise, run, and slope of a line segment relative to some horizontal line.
Adequate slope for sledding Surface function
Located in publicly accessible open space Local Function ...
Thus, this slope displacement is more pronounced in the near range part of a scene than in the far. Geometrically, foreshortening occurs wherever the radar wavefront is steeper than the slope angles illuminated by the beam.
Boat Ramp
A sloped area partially above and below the water surface, used for launching or landing watercraft
Drydock
An enclosure for repairing ships, from which the water can be drained ...
s = slope distance between stations (in kilometers)
5-23. This formula will also be applied to the vertical observations performed at the station at the other end of the observed line (reciprocal observations).
talus A slope built up by the accumulation of rock waste at the foot of a cliff or ridge.
tar A thick brown to black viscous organic liquid, too thick to migrate easily through most porous sediment.
Lest's derive slopes from the DTM. Make the Filled Tutorial the active theme and Select Surface/Derive slope from the menu. We get another grid, the values are a slope in degree.
continental slope -- n. Part of the continental margin; the ocean floor from the continental shelf to the continental rise or oceanic trench. Usually to a depth of about 200 meters.
Styles For The Slope. The belt-borne component is shown in the opening PHOTO.
Talus Slope A slope that is composed of talus. Tarn A small mountain lake that occurs inside a cirque basin. Taxon A classification category for a group of organisms.
map, slope (clinometric map) Map showing the degree of steepness of the Earth's surface by the use of various colors or shading for critical ranges of slope.
Hachures Lines of varying width used to denote steepness of slope. A common method of relief depiction in the 18th and 19th century, now relegated to embankments cuts.
slope p. 158 a multicomponent property associated with a surface at each point; the vertical component (gradient) expresses the local rate of change, the horizontal component (aspect) gives the direction. soil inclusions p.
[LINK] Continue to Overlay Return to GIS index Overlay Using maps of wetlands, slopes, streams, land use, and soils, ...
Variations in the height and slope of Earth's surface. Also used in reference to the vertical difference between the highest and lowest elevations of an area.
Remote Sensing:
The collection of information about an object or area from a distance.
Extensive parametric editing facilities to incorporate changes in a tower's overall shape and slope, panel dimensions, and panel face configurations increases productivity by providing continuous change management.
A DEM normally consists of a regular matrix of elevation values, from which altitude functions such as slope and aspect can be calculated, and which may be rendered for visualisation as isolines (contours), perspective or panoramic views, etc.
Elevation, slope, and aspect can be important information for a variety of wildlife applications of GISs.
Identification of what type of vegetation is located where, along with slope, aspect, elevation, and the presence of water
Impact of human habitation on the environment, e.g.
Short lines used for shading and denoting surfaces in relief (as in map drawing) in the direction of greatest slope. The thickness and spacing of the lines indicate the amount of relief.
When I do this I usually report the slope and intercept so that the image
integers can be mapped back to the source elevations if this is necessary.
You might experiment if you have some known elevations and see if you can ...
Additionally, from a series of three-dimensional points, or digital elevation model, isopleth lines representing elevation contours can be generated, along with slope analysis, shaded relief, and other elevation products.
Contours that appear relatively close together or that create a darker pattern, indicate that there is an abrupt change in elevation or a steep slope. Contours widely spaced depict relatively flat terrain.
Where a river descends quickly over sloped topography, rapids with whitewater or even waterfalls occur. Rapids are often used for recreational purposes (see Whitewater canoeing and kayaking).
Can I display TINs by slope, aspect, or other terrain analysis methods?
Yes, you can display TINs by slope, aspect, node elevation, and similar edges, as well as many other analysis methods, through the TIN symbology options.
9 Area with steep slopes
Figure 1.10 Area suitable for building
We have already seen that there are places in the heart of Kathmandu valley which are frequently affected by floods. Figure 1.8 shows the area least 500 m away from major rivers.
Soils of one series can differ in texture of the surface soil and in slope, stoniness, or some other characterisitic that affects use of the soils. On the basis of such differences, a soil series is divided into phases.
Using maps of wetlands, slopes, streams, land use, and soils (figs. 19a-f), the GIS might produce a new map layer or overlay that ranks the wetlands according to their relative sensitivity to damage from nutrient runoff.
Identify all portions of all properties with greater than 15% slope. (Layers are properties and slopes.)
Show regions where land use changed between 1990 and 2000. (Layers are land use 1990 and land use 2000.) ...
the size, material and slope for a sanitary sewer line), then a coding sheet is unnecessary.
pit A point around which all slopes are positive (i.e., upward).
pixel A contraction of the words picture element. The smallest unit of information in an image or raster map. Referred to as a cell in an image or grid.
Horizontal direction in which a slope faces commonly expressed as the direction clockwise from north.
Aspect Ratio
Numerical ratio of picture width to height when discussing video displays.
ridgeline - A line representing the intersection or top between opposite slopes. Commonly used as a parcel line.
satellite imagery - Imagery that is collected using a space-borne remote system that is in orbit around the Earth.
6. Which mountain has steeper slopes?
___________________________
7. Are the contour lines closer together on Able Hill or Baker Hill?
Escarpment:
A long cliff or steep slope separating two comparatively level or more gently sloping surfaces and resulting from erosion or faulting.
Using the 3D Analyst toolbar, you can select the "Surface Analysis" tab and render a hillshade, slope, aspect or contour model. (Be careful not use too small a contour interval- it'll lock up the program.) ...
Height above or below sea level. For example, resources describing altitude, bathymetry, digital elevation models, slope, and products derived from this information.
Environment ...
Breakline - A line with a series of vertices that defines points of inflection in the topographic surface of the earth (i.e., places where there are sharp changes in the direction of slope on the earth's surface).
This is based on a 'flat earth concept' - ie that there are no hills or valleys. As such it is a horizontal scale which makes no allowance for slope.
The scale of a map is usually depicted in two ways ...
For example, vertical control points were established by using differential or 'spirit' levelling, which is suited to gradual slopes such as roads and railways.
Raster data is best suited for continuous data such as slope, rainfall, or the amount of light reflecting off the ground (as in a photograph). Aerial photographs and satellite images are examples of raster images used in mapping.
Search and Rescue: With SA turned off, GPS will become a more powerful and compelling tool in helping rescue teams search for individuals lost at sea, on mountains or ski slopes, in deserts, and in wilderness environments.
This involves a variety of point interpolation techniques including slope and aspect calculations, contour generation, and Thiessen polygons.
Surface processes such as rainfall runoff modelling, flowline construction (as shown), slope stability analysis, and spatial data analysis are just a few of the many applications of GRASS to engineering and land planning.
At its simplest, this could be a visual operation, but analytical operations require one or more data layers to be joined physically. This overlay, or spatial join, can integrate data on soils, slope, and vegetation, ...
Some GPS receivers have the ability to collect an offset point, which involves recording a GPS position at a location where GPS signals are available while also recording the distance, bearing and slope from the GPS antenna to the position of ...
However, the Mercator map alone is not enough for general navigation. Also, in this equatorial form, the polar regions can not be included (here the loxodrome has constant slope and infinite length; ...
(or cost) required to traverse through a portion of a network such as a line, or through one cell in a grid system. Resistance may be any number of factors defined by the user such as travel distance, time, speed of travel times the length, slope, ...
 See also: Information, Feature, GIS, Geographic, Class
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