Epidemiology & Technology

Understanding GeoJSON data

GeoJSON files are a standard way of storing GIS data

These contain not only the coordinates but also the attribute data.

These files have a key: value based hierarchial data structure

You may think of these keys as variable names and values as the dara.

In computer science terminology, these are Objects.

GeoJSON follows a hierarchical organizational pattern for storing data.

At top level, GeoJSON objects have a “Type” : “FeaturesCollection” property and a “Features” property whose value is an array of objects. Each child object of this has

  • “type” = “feature”,
  • “geometry” = containes the GIS Coordinate data
  • “properties” = contains the attribute data – Name, address, contact, facilities, serivices, whjatever catches your fancy !

An example is below

{
  "type": "FeatureCollection",
    "features":
         [
                {  "type":"Feature",
                   "properties":{"stname":"Ladakh", "stcode11":"37", "Zone":1},
                    "geometry":{"type":"Polygon","coordinates":[[[76.79597690427906,33.254862798480694],[76.84001196990546,33.24745610418781],[76.82907875343152,33.21452704946003],[76.83517270517953,33.21128355907968],[76.83658734232273,33.20461563451404],[76.82127348926049,33.19289674498482],[76.82454441695303,33.1837625022087],[76.81833643027372,33.176822309329424],[76.81604718116786,33.1723212189062],[76.81716805540245,33.16847486805422],[76.81991059826144,33.16503616949572],[76.81932963969592,33.16054010868139],[76.8213461884174,33.15468154456006],[76.83511938159474,33.14094659478245],[76.84083972820888,33.140232904961266],[76.84705222641018,33.136636478494594],[76.87038777748832,33.11039282362967],[76.87826437279094,33.115211667379434],[76.88655040703043,33.11905249689351],[76.89505709806708,33.11304505985481],[76.90854560849648,33.07950106874185],[76.91415486308073,33.07452824644018],[76.91787282766556,33.06283178234805],[76.92798453369932,33.04887294447344],[76.93521995968804,33.03231268487111],[77.0161397699713,32.98801193335157],[77.02893675499011,32.99167342936302],[77.03761640193176,32.99016519617969],[77.04213234436857,32.99537268108258],[77.05304121385255,32.998076841981195],[77.09258906542823,32.97164605936291],[77.11483026163846,32.975855724586],[77.12089078141831,32.98548434729315],[77.1301082541705,32.98239095375711],[77.13781103989254,32.98096975004825],[77.14524780650457,32.982087050754075],[77.15413219109712,32.97868239361911],[77.15358933039796,32.97266893494761],[77.15201380823324,32.96770053155851],[77.15407889376561,32.95595360563208],[77.16382592236026,32.954575013653866],[77.16377759682946,32.94092047331797],[77.16377759729899,32.94092036341351],[77.16644221926798,32.93953472093297],[77.16622891786585,32.93605636261887],[77.16460543528696,32.93253108085291],[77.16688463751737,32.923923235941636],[77.16836140395793,32.91834507642732],[77.17505588381225,32.9113400189068],[77.2458971057553,32.893548099706074],[77.33915515454768,32.82015011908141],[77.35350472947295,32.816647852805914],[77.36594977231469,32.81892131673962],[77.37404789308768,32.822983881538434],[77.37713224480498,32.83588641765323],[77.38027230431945,32.84433670269094],[77.37742721614602,32.849358076233834],[77.3763469516513,32.8541615149721],[77.37731031265463,32.857343296795506],[77.38071175337957,32.861285727942146],[77.38888707496452,32.865171027255336],[77.39708019765577,32.87859657305176],[77.47291396069852,32.85938140984992],[77.53736082743465,32.88498576414252],[77.59946051165188,32.936819774641314],[77.67130807005952,32.956935323614566],[77.67801964773533,32.966502710424955],[77.68112974592349,32.973471799388335],[77.6832842425735,32.98359280821521],[77.68894579466273,32.9838301426281],[77.69606996301745,32.97825623455146],[77.69755483823944,32.975320179155844],[77.71308900425588,32.975329075059825],[77.71794574636954,32.96653942868989],[77.72638118169593,32.964810479213526],[77.73056538418655,32.96929088570558],[77.74121387825663,32.96182792148711],[77.75447011890105,32.94530191480828],[77.77757308929931,32.924785692214805],[77.7960235185658,32.91312044279028],[77.80814363961017,32.902737070477215],[77.79068905905186,32.88822093933181],[77.78389287046515,32.87760086551866],[77.77930439284856,32.86211676103656],[77.84295614281088,32.837064479059],[77.86545975546355,32.825568336071335],[77.87039595481016,32.82232830927196],[77.87281631299834,32.81833360216445],[77.87910792057387,32.813288555608416],[77.8816589932367,32.808572845972044],[77.88236851524276,32.80362470006305],[77.88681180914844,32.7974651943282],[77.8847719307777,32.78737470089272],[77.88477191640483,32.78737460166211],[77.89003509348531,32.7833244107556],[77.89407263059294,32.7770774135802],[77.89866452678763,32.772463958738264],[77.90865045975929,32.77155342275284],[77.91728569459646,32.772356753450296],[77.93290595230644,32.763076449794056],[77.93569223951712,32.7539133656917],[77.92954814266119,32.73348222724416],[77.93616436493973,32.727760792294816],[77.92973252457115,32.72272274911791],[77.92711748604829,32.71835448914664],[77.92613740426907,32.71335202060756],[77.92392038881864,32.70930214812208],[77.92085922511562,32.69002444071484],[77.92857774744428,32.68509351674193],[77.93781989332882,32.67640839093163],[77.99415769106687,32.58868209037253],[78.05328338573062,32.58863860461027],[78.05912613375685,32.59592658922557],[78.05900046008719,32.6019990704096],[78.05900041519983,32.60199912261832],[78.05900041363157,32.60199921897258],[78.05429027665944,32.60757253286737],[78.05197210991116,32.61236439722036],[78.06167120224332,32.625547540743234],[78.07658878060325,32.62128814368608],[78.08289786478518,32.62097907806499],[78.08502524865513,32.62231281637109],[78.09056623758087,32.641114752832806],[78.11104328906953,32.65886276775268],[78.11693235763104,32.65668393375897],[78.1337989459856,32.639086501960776],[78.15371867793878,32.66700949697526],[78.20167283477076,32.66050230101061],[78.31360850719051,32.709415192571036],[78.31645911478405,32.71635204795128],[78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                  },
          ]
}Code language: JSON / JSON with Comments (json)

ANOTHER EXAMPLE

{
"type": "FeatureCollection",
"name": "Data2",
"features": [
   { "type": "Feature", 
     "properties": { "sr": 6864, "nm": "XXXXXXXXX", "s": 19, "d": 337, "o": "Private", "a": "XXXXXXXXXXX Kolkata", "lat": 24.6199, "long": 89.43974Y99, "ph": "xxxxxxxxxxx", "m": "xxxxx.xxxxxxx@xxxxx.com", "h": "Dr xxxxx xxxxx", "emer": 0, "ot": 1, "eb": 0, "res": 1, "lv": 1, "c": 1, "g": 1, "sq": 1, "vr": 1, "kp": 1, "op": 1, "no": 1, "pes": 1, "go": 1 }, 
     "geometry": { "type": "Point", "coordinates": [ 88.12345567, 21.1234567 ] } },
   { "type": "Feature", 
     "properties": { "sr": 6865, "nm": "YYYYYYYYYY", "s": 19, "d": 338, "o": "Private", "a": "YYYYYYYY", "lat": 23.86727582, "long": 89.3951786, "ph": "033-xxxxxxxxxx", "m": "xxxxx@xxxxx.com", "h": "Dr xxxxx xxxxx", "emer": 0, "ot": 1, "eb": 0, "res": 0, "lv": 0, "c": 1, "g": 1, "sq": 1, "vr": 0, "kp": 0, "op": 0, "no": 1, "pes": 0, "go": 1 }, 
     "geometry": { "type": "Point", "coordinates": [ 87.364583, 23.856843444 ] } },
   { "type": "Feature", 
     "properties": { "sr": 6866, "nm": "ZZZZZZZZZZ", "s": 19, "d": 343, "o": "NGO\/Charitable\/Trust\/Society", "a": "ZZZZZZZZZZ", "lat": 26.835774, "long": 88.867066048, "ph": "ZZZZZZZZZZ", "m": "xxxxx@xxxxx.com", "h": "Dr xxxxx xxxxx", "emer": 1, "ot": 1, "eb": 0, "res": 0, "lv": 0, "c": 1, "g": 1, "sq": 1, "vr": 0, "kp": 1, "op": 0, "no": 0, "pes": 0, "go": 1 }, 
     "geometry": { "type": "Point", "coordinates": [ 88.874684, 22.84568745 ] } }
]
}
Code language: JSON / JSON with Comments (json)

I often use QGIS sofware to add attribute data (imported as delimited text file) to GIS coordinate data layer and then export the merged data as GeoJSON for use with leaflet..

I also use Mapshaper online service to decrease resolution of GeoJSON files to make them smaller in suze

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