Sökning: "Map algebra"

Hittade 4 uppsatser innehållade orden Map algebra.

  1. 1. A GIS-Based Method of Deriving Spatially Distributed Unit Hydrographs

    Master-uppsats, KTH/Hållbar utveckling, miljövetenskap och teknik

    Författare :Ann-Sofi Lenander; [2021]
    Nyckelord :the unit hydrograph; GIS; ArcPy; design storm; SCS-CN method; spatial data; excess rainfall; enhetshydrografen; GIS; Arcpy; design regn; SCS-CN metoden; geodata; effektivt regn;

    Sammanfattning : Prior to using hydraulic and spatially distributed modelling softwares, the theory of the unit hydrograph was a commonly used tool for modelling of surface and runoff water. While distributed models often provide detailed results from extensive calculation durations, the unit hydrograph have been questioned for simplifying the physical characteristics of the watershed modelled. LÄS MER

  3. 2. Focal Operations with Network Distance Based Neighbourhoods : Implementation, Application and Visualization

    Kandidat-uppsats, KTH/Geoinformatik

    Författare :Nore Ottenby; [2015]
    Nyckelord :GIS; Map algebra; Focal sum; Focal Proximity; Network Analysis; Network Space; Location Problem; City Planning; Arcpy; Density map; Hotspot map;

    Sammanfattning : In spatial analysis, many operations are performed considering the neighbouring locations of a feature. The standard definition of a neighbourhood is an area confined by geometrical length and direction with respect to its focus. When allocating a location for a service, the population distribution is often considered. LÄS MER

  4. 3. Properties of a generalized Arnold’s discrete cat map

    Magister-uppsats, Linnéuniversitetet/Institutionen för matematik (MA)

    Författare :Fredrik Svanström; [2014]
    Nyckelord :Arnold’s discrete cat map; Hyperbolic toral automorphism; Discrete-time dynamical systems; Poincaré recurrence theorem; Number theory; Linear algebra; Fibonacci numbers; Pell numbers; Cryptography;

    Sammanfattning : After reviewing some properties of the two dimensional hyperbolic toral automorphism called Arnold's discrete cat map, including its generalizations with matrices having positive unit determinant, this thesis contains a definition of a novel cat map where the elements of the matrix are found in the sequence of Pell numbers. This mapping is therefore denoted as Pell's cat map. LÄS MER

  5. 4. Modelling the Cross-Country Trafficability with Geographical Information Systems

    Magister-uppsats, Institutionen för datavetenskap

    Författare :Aleksander Karol Gumos; [2005]
    Nyckelord :GIS; Cross-Country Trafficability; Digital Elevation Model DEM ; TIN; Hydrologic Modelling; Soil Mechanics; Compound Topographic Index; Map Algebra; Multicriteria Evaluation; Map-Based Modelling; Raster Data Model; Cost-Weightet Distance Functions; Spatial Modelling; 3D-Aided Scene Animations;

    Sammanfattning : The main objectives of this work were to investigate Geographical Information Systems techniques for modelling a cross-country trafficability. To accomplished stated tasks, reciprocal relationships between the soil deposits, local hydrology, geology and geomorphology were studied in relation to the study area in South-Eastern Sweden. LÄS MER