Regions in ArcINFO

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Regions in ArcINFO. Regions can handle overlapping, noncontiguous and nested areas and makes real-world features easier to represent and analyze. Data management is more efficient, as each region only requires one attribute record. - PowerPoint PPT Presentation

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  • Regions in ArcINFORegions can handle overlapping, noncontiguous and nested areas and makes real-world features easier to represent and analyze.

    Data management is more efficient, as each region only requires one attribute record.Overlapping ranges Non-contiguous areas

  • Overlapping polygons - ranges for multiple wildlife species - fires (burned areas) through time, fire atlas data - countries of the world through time - managing habitats, that are not spatially exclusive - managing different floor plans for a building

    Non-planar features - data in different planes, for example, soil data collected at various soils depths - geological data that overlaps at various depth levels

    Noncontiguous areas - islands that comprise the state of Hawaii as a single feature

    Regions in ArcINFO

  • Regions can have VOID AREAS

  • Regions may have multiple sub-classes - A regions coverage may contain one or more region subclasses - A subclass contains one or more region features - Each region subclass can be visualized as lying in its own plane above the polygon topology. - Each region subclass has its own set of attributes because each subclass has its own PAT.

  • POLYGONS

    - cannot overlap - single contiguous area - feature class partitions space - cannot be nested - one feature class per cover REGIONS - can overlap- multiple noncontiguous areas- void areas allowed- can have nested features- many feature classes per cover

  • Creating Regions ?

    - Regions can be created from coordinate files or digitizing.

    - Regions can be created and edited interactively using ARCEDIT.

    - Regions can be generated directly from existing coverages using points or nodes, arcs, polygons or existing regions.

    - Regions can be created from queries and logical operations on polygon or region coverages

  • REGIONPOLY converting regions to polygon coverages

    POLYREGION creating regions from polygons in ArcINFO

  • Region commands in ArcInfo, ArcPlot and ArcEdit

  • . a few region commandsregionpolylist creates an INFO file that lists the polygons that belong to each region in the specified subclasses

    regionpolycount counts the total number of regions, and regions by subclass, for each polygon. The selected polygon belongs to two regions, one from each subclass

    regionxarea creates an output INFO file to describe the overlap relationship between the two regions in area and percent

    regionselect selects a set for polygons or regions through Boolean selection of attribute values of polygons or regions from multiple subclasses

    regionquery creates new regions based on the attribute values of input region or polygon layers and aggregates regions according to specified attribute items.

  • Example of fire-atlas data from the Selway Bitterroot Wilderness

  • Western redcedarDouglas-firGrand FirLower Subalpine DryLower Subalpine MoistUpper Subalpine DryUpper Subalpine MoistRock/Alpine/Barren LandPotential Vegetation Types

  • Fire Eras Modern Suppression 1935 - 1974 Wildland Fire Use 1975 - 1996 Pre-Modern Suppression Prior to 1935

  • Changes within the fire eras

    Fire frequencySeverity

  • Fire RegimeThe nature of fires occurring over an extended period of time-(Brown, 1995)Na Extremely infrequent Very infrequent Infrequent Frequent Very frequentFire frequencyHistoric Fire Regimes1900, ICRBCurrent Fire Regimes1995, ICRB

  • Fire regimes have been described with the help of Digital Fire Atlases and Aerial Photo Interpretation

  • Stand Replacing Non-Lethal Mixed UnknownResults Fire Severity .by Casey TeskeArea (Ha)

    table arrangement matt

    Matt Data

    PVT_CodePVTy1880y1885y1889y1890y1895y1898y1900y1910y1914y1915y1917y1918y1919y1920y1921y1923y1924y1931y1932y1933y1934y1935y1938y1940y1961y1962y1967y1971y1979y1981y1982y1983y1984y1985y1986y1987y1988y1991y1992y1993y1994y1996TOTAL (m^2) for PeriodTOTAL (ha) for PeriodTOTAL (m^2) for PMSTOTAL (ha) for PMSTOTAL (m^2) for MSTOTAL (ha) for MSTOTAL (m^2) for PNFTOTAL (ha) for PNF

    4Douglas-Fir978496288787708341303129565508335467896181152895236850321997308867322821114711418482738588398049055739756451264720411710182022956737784187573149598766778527894934992723164017112432411151938239435938813701503850821368862623172632184456040932402735798329765798339890734739891537025453717555537517556

    3Grand Fir5379282989936184807110796286156612214202069210496895140607738446456974982365577046975478934061463247571934303912686005282879896852762602348182371147513327312498621253336626729915516512312312576612820414111833551380923954842398809150684547436433070947633071276390493276392196484220521224985212

    6Lower Subalpine Dry249923526660397596824320818145142402061607096907398817013251512240699642345360475059720810232927912751448405511840352579579652236660873065270892372036503619428011172730556153754296530161344169122714636612952073977584836976739929923106775957101555933972247176431064128710926085705118916705124986252434986315203578152019129009619129

    5Lower Subalpine Moist1524319918647419440370340065531114167957977153017771469878151100788516087922732397648910390141449631864557372486331086352199292660342627840173722383299337993414005864707025021705342150915067300104143055616853609147673556733349332482581123208726386184330641894330634222493234222118119201181790273377903

    9Persistent Herblands27166510483083159457891646439577403162847113912633572564697544315724344055683432797381835855090326900086207006113422340053173929939502979476499520277213735842577998425828324006283246332346137906691379

    10Rock/Alpine/Barren Land1054054451566427270350565425076334588615525544412896123165122554592076932133513680732806913095086391816036000216870632531215218438776330560223914120404672601371371883574882052087448355039913604799046239090463992501139936932999693436043804360

    8Upper Subalpine Dry2266081494985068270552800922812841245911335830325419513992470984502603561268433518963315867824383132041681418814205671082614123496213208338306752012233131233398987072189876927680269286115955612144779641448

    7Upper Subalpine Moist9144843454672412841846030540108681349980286051141312678975583341112838352613630427335158930352760722371516272343146102858472731963643664396080910715272630495986305022424060224219895931996082333608

    11Water280884279007200360034586618355310562710574172236639008733010800701904549841693831054907090016640591669730459788230960278460

    2Western Red Cedar9689012318075319734011714732042391182132520134794812950414579255188181193184880327954282907766286140474098245425851202768307388185211310646713110647913624929136279543150766861508

    DFA Total Area Burned / Yr (m^2)44218785852513151623587679296793996635962170661989945166484627338470330477616920473662828183828542027637219502122271912027956749567972546573039127692409341236137729899356972813102402135119318236891816611029653097413074329523681991831245495444656252536486756816423930156711984508922732933073611716096673147178617557518176843343217684350200290502059163012159163

    DFA Total Area Burned / Yr (HA)44228515162679339976221990664853847478204782828542372212232037507253076934124733571310135182181730974132951992454472536568293021984527337416131471756241026

    Pat Data

    PVT_CodePVTy1880y1885y1889y1890y1895y1898y1900y1910y1914y1915y1917y1918y1919y1920y1921y1923y1924y1928y1931y1933y1934y1935y1939y1940y1961y1967y1973y1979y1981y1982y1983y1984y1985y1986y1987y1988y1989y1991y1992y1994y1996TOTAL (m^2) for PeriodTOTAL (ha) for PeriodTOTAL (m^2) for PMSTOTAL (ha) for PMSTOTAL (m^2) for MSTOTAL (ha) for MSTOTAL (m^2) for PNFTOTAL (ha) for PNF

    4Douglas-Fir1660112623153744257466885236989851084754337392411434986150534398600337665874756680619266728484902246824403841076522077819308681251644992212718168018355381624562374608472131953216068142284052373358574246505958574385564685917756447307297307307356157066956157939345293915976560815977

    3Grand Fir42219279065134809334743416260553373572238468917027583110760169181535423335448978953788928028198742348989160008842218139697766812958321440401962302135384898893182120401973103161390272288778774601647182609274105521020005432694166078921367434685536854334736854322162539322167031694703393491143935

    6Lower Subalpine Dry298782471212887672315332035202908160302124816258213125857881550124950552919714107541378294279913464576061924920277832423141631270565664355478791426452027999865343012196565200568566109121641922104664513085022462967942665265241178660158796799284718977163915332231994104304036867020200867026967503126967511942161119415832772715833

    5Lower Subalpine Moist184098954624124405537909278142996303659503719904516026428612163615973256287405148973966198131110083581552567608648150553649192187255927336158486226535226459371469744261167149934125223429037388356167122801371260184845383366203613629703422473847321395647321417081520417085058263506510741735107

    9Persistent Herblands21087916323052577203939471628277447117625840792816172312165938623128900687715424799179258854862167589775505687611100439718340730250481748334989232190411370986000562560014418294144181194308119146283761463

    10Rock/Alpine/Barren Land95116861237522911633947583326556163316865929923557113327889439787227363404443253983244950001555726543173481928507770973492862425823152610754167543583681225247307043469744061824879568539612971014841101975338101985338159953387886335789407074034071

    8Upper Subalpine Dry415075418688769072201791794138085038716654288286818595823332011194801713290175215016035116572012633405199054119789071930695336409274885913164671164747382672119872512197932681994995889609249920740299218328221283284