Mapinfo 10 how to show area intersection between rings
You might also use Point Distance to find the distance and direction to all the water wells within a given distance of a test well where you identified a contaminant.īelow is an example of point distance analysis. You might find a stronger correlation for some pairs than for others and use your results to target the placement of public trash cans or police patrols. You could join the resulting table to the business and problem attribute tables and calculate summary statistics for the distances between types of business and problems. For example, you might compare the distances between one set of points representing several types of businesses (such as theaters, fast food restaurants, engineering firms, and hardware stores) and another set of points representing the locations of community problems (litter, broken windows, spray-paint graffiti), limiting the search to one mile to look for local relationships. You can use the Point Distance tool to look at proximity relationships between two sets of things. This table can be used for statistical analyses, or it can be joined to one of the feature classes to show the distance to points in the other feature class. Point Distance calculates the distance from each point in one feature class to all the points within a given search radius in another feature class. The points are symbolized using graduated colors based on distance to a river, and they're labeled with the distance.īelow is part of the attribute table of the points, showing the distance to the nearest river feature: The Near tool will also add the Feature Identifier and, optionally, coordinates of and the angle toward the nearest feature.īelow is an example showing points near river features. You might use Near to find the closest stream for a set of wildlife observations or the closest bus stops to a set of tourist destinations. The Near tool calculates the distance from each point in one feature class to the nearest point or line feature in another feature class.
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Buffers are sometimes used to clip data to a given study area or to exclude features within a critical distance of something from further consideration in an analysis.īuffer and Multiple Ring Buffer create area features at a specified distance (or several specified distances) around the input features.īelow are examples of buffered lines and points:īelow is an example of multiple ring buffers:īuffers can be used to select features in another feature class, or they can be combined with other features using an overlay tool, to find parts of features that fall in the buffer areas.īelow is an example of buffered points overlaid with polygon features:īelow is an example of a study area clipped to a buffer area: You could use the multiring buffer tool to classify the areas around a feature into near, moderate distance, and long distance classes for an analysis. For example, you might buffer a school by one mile and use the buffer to select all the students that live more than one mile from the school to plan for their transportation to and from school. Buffers are usually used to delineate protected zones around features or to show areas of influence. These tools output information with buffer features or tables. Feature-based proximity toolsįor feature data, the tools found in the Proximity toolset can be used to discover proximity relationships. The raster-based cost-distance tools accumulate the cost of each cell traversed between sources and destinations. The raster-based Euclidean distance tools measure distances from the center of source cells to the center of destination cells. The Near tool adds a distance measurement attribute to the input features. For example, the Buffer tool outputs polygon features, which can then be used as input to overlay or spatial selection tools such as Select Layer By Location. The feature-based tools vary in the types of output they produce. Proximity tools can be divided into two categories depending on the type of input the tool accepts: features or rasters. What is the shortest street network route from some location to another?.What is the distance between each feature in a layer and the features in another layer?.What is the nearest or farthest feature from something?.What is the distance between two locations?.Do any roads pass within 1,000 meters of a stream?.
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One of the most basic questions asked of a GIS is "what's near what?" For example: