Mapping from a database Peterson

Linux PHP and MySQL were largely developed under Linux – open source operating system based on UNIX Linus Torvalds – – “Hello everybody out there! I'm doing a (free) operating system … (just a hobby, won't be big and professional) for 386(486) AT clones. This has been brewing since april, and is starting to get ready.I'd like any feedback.”

PHP and MySQL Most Linux installation procedures include the option of installing PHP and MySQL. Administration of online databases is done through phpMyAdmin – Available through the cPanel Purpose of exercises: – Develop familiarity with PHP – Input and query MySQL tables

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mysql_connect.php

All Capitals

//connection to database and querying <?php include 'mysql_connect.php'; $table = "us_capitals"; $sql = "SELECT name, usstate, population, Y(location), X(location) FROM $table"; $res = mysql_query($sql); if($res){ $num = mysql_num_rows($res); while($row = mysql_fetch_array($res)){ // contents one row of database $lat = $row['X(location)']; $lon = $row['Y(location)']; $name = $row['name']; $state = $row['usstate']; $pop = $row['population']; // create marker echo 'var myLatlng = new google.maps.LatLng('.$lat.','.$lon.');'; echo 'var marker = new google.maps.Marker({position: myLatlng, map: map, title: "'.$name.', Population: '.$pop.'", icon: image, shadow: shadow});'; // info message will be attached echo 'attachMessage(marker, "'.$name.'", "'.$state.'", "'.$pop.'");'; } } else echo "alert('SQL-Error getting data from database...')"; mysql_close($conn); ?>

North of Omaha / less than 500,000

//connection to database and querying <?php include 'mysql_connect.php'; $table = "us_capitals"; $sql = "SELECT name, usstate, population, Y(location), X(location) FROM $table WHERE X(location) > AND population < "; $res = mysql_query($sql);

Select within box

<?php //define coordinates and draw rectangle to map include 'mysql_connect.php'; $table = "us_capitals"; $sql =" SELECT name, Y(location), X(location), usstate, population FROM us_capitals WHERE Intersects( location, GeomFromText( 'POLYGON((40 -96, , , , ))' ) ) ";

DROP TABLE IF EXISTS cities; create table cities ( city VARCHAR(30), location GEOMETRY NOT NULL, SPATIAL INDEX(location), PRIMARY KEY (city) ); INSERT INTO cities (city, location) VALUES ("Omaha", GeomFromText('POINT( )')); INSERT INTO cities (city, location) VALUES ("Atlanta", GeomFromText('POINT( )')); INSERT INTO cities (city, location) VALUES ("Lincoln", GeomFromText('POINT( )')); DROP TABLE IF EXISTS dl_airports; create table dl_airports ( city VARCHAR(30), airport VARCHAR(30), code VARCHAR(3), FOREIGN KEY (city) REFERENCES cities(city), PRIMARY KEY (code) ); INSERT INTO dl_airports (city, airport, code) VALUES ("Omaha","Omaha Eppley Airfield", "OMA"); INSERT INTO dl_airports (city, airport, code) VALUES ("Atlanta","Hartsfield-Jackson International Airport", "ATL"); INSERT INTO dl_airports (city, airport, code) VALUES ("Lincoln","Municipal Airport", "LNK"); DROP TABLE IF EXISTS dl_routes; create table dl_routes ( airportCode VARCHAR(3), destinationCode VARCHAR(3), FOREIGN KEY (airportCode) references dl_airports(code), FOREIGN KEY (destinationCode) references dl_airports(code) ); INSERT INTO dl_routes (airportCode, destinationCode) VALUES ("OMA","ATL"); INSERT INTO dl_routes (airportCode, destinationCode) VALUES ("OMA","DET"); INSERT INTO dl_routes (airportCode, destinationCode) VALUES ("OMA","MEM"); Part of the SQL code for entering three tables that provide city location, airport information, and airline connections.

Flight Routes

<?php include 'mysql_connect.php'; $sql = "SELECT cDep.city AS departure, X( cDep.location ) AS latDep, Y( cDep.location ) AS lngDep, cDst.city AS destination, X( cDst.location ) AS latDest, Y( cDst.location ) AS lngDest FROM ((( dl_routes AS rt INNER JOIN dl_airports AS ap1 ON rt.airportcode = ap1.code ) INNER JOIN dl_airports AS ap2 ON rt.destinationcode = ap2.code ) INNER JOIN cities AS cDep ON cDep.city = ap1.city_name ) INNER JOIN cities AS cDst ON cDst.city = ap2.city_name"; $res = mysql_query($sql); if($res){ $num = mysql_num_rows($res); while($row = mysql_fetch_array($res)){ echo "var flightPlanCoordinates = [ new google.maps.LatLng(".$row['latDep'].", ".$row['lngDep']."), new google.maps.LatLng(".$row['latDest'].", ".$row['lngDest'].") ]; flightPath = new google.maps.Polyline({ path: flightPlanCoordinates, strokeColor: \"#FF0000\", strokeOpacity: 0.8, geodesic: true, strokeWeight: 1 }); flightPath.setMap(map);"; } } else echo "alert('SQL-Error getting data from database...')"; mysql_close($conn); ?>

Selected routes

$sql = "SELECT cDep.city AS departure, X( cDep.location ) AS latDep, Y( cDep.location ) AS lngDep, cDst.city AS destination, X( cDst.location ) AS latDest, Y( cDst.location ) AS lngDest FROM ( ( dl_routes AS rt INNER JOIN dl_airports AS ap1 ON rt.airportcode = ap1.code ) INNER JOIN dl_airports AS ap2 ON rt.destinationcode = ap2.code ) INNER JOIN cities AS cDep ON cDep.city = ap1.city_name ) INNER JOIN cities AS cDst ON cDst.city = ap2.city_name WHERE cDep.city = 'Omaha'"; $res = mysql_query($sql);

create table ne_counties ( strokecolor VARCHAR(7), strokewidth INT(5), strokeopacity FLOAT(5), fillcolor VARCHAR(7), fillopacity FLOAT(5), popdata INT(15), name VARCHAR(30), geom GEOMETRY NOT NULL, SPATIAL INDEX(geom) ); INSERT INTO ne_counties (strokecolor, strokewidth, strokeopacity, fillcolor, fillopacity, popdata, name, geom) VALUES ("#008800",1,1.0,"#FFCC00", ,33185,"county", GeomFromText('POLYGON(( , , , , , , , , , , , , ))')); INSERT INTO ne_counties (strokecolor, strokewidth, strokeopacity, fillcolor, fillopacity, popdata, name, geom) VALUES ("#008800",1,1.0,"#FFCC00", ,6931,"county", GeomFromText('POLYGON(( , , , , , , , , , , , , ))')); MySQL commands, attributes, and coordinates for placing two county polygons for Nebraska into a MySQL database.

Nebraska county polygons

//connection to database and querying <?php include 'mysql_connect.php'; $sql = "SELECT popdata, AsText(ExteriorRing(geom)) AS linestring FROM ne_counties;"; $res = mysql_query($sql); // first statement -> get all polygons if($res){ // loop through all polygons while($row = mysql_fetch_array($res)){ $linestring = $row['linestring']; //points of current county polygon $pop = $row['popdata']; //population of current county //linestring includes all points of current polygon LINESTRING( , ) //delete not needed characters $clearedLS = str_replace(array("LINESTRING(", ",", ")"),array(""," ",""),$linestring); //parse the string in PHP and store coordinates in array $coordinates = explode(" ", $clearedLS); //read coordinates from array by pair

//and finally create javascript GM latitude/longitude objects for polygons echo "var pts = new Array();"; $j=0; for ($i =0; $i<count($coordinates); $i=$i+2){ echo "pts[".$j."] = new google.maps.LatLng(".$coordinates[$i].",".$coordinates[$i+1].");"; $j++; } echo "polygon = new google.maps.Polygon({ paths: pts, strokeColor: '#0000FF', strokeOpacity: 1.0, strokeWeight: 0.5, fillColor: '#0000FF', fillOpacity: 0.4 });"; echo "polygon.setMap(map);"; } } else echo "alert('SQL-Error getting data from database...')"; mysql_close($conn); ?>

Nebraska county population

// Find the min and max population values for the 93 counties after doing a non-linear transformation using the log function var min= ; var max= ; for (var i = 0; i < 93; i++) { // Log the data to deal with counties with large populations popdata[i] = Math.log(popdata[i]) if (popdata[i] < min) { min=popdata[i] } if (popdata[i] > max) { max=popdata[i] } } // Find the range and compute the opacities for each polygon var range = max-min // compute an opacity as a range of the data values opacities = new Array () for (var i = 0; i < 93; i++) { opacities[i] = 1-((max - popdata[i]) / range) }

Counties with less than 50,000 $sql = "SELECT popdata, AsText(ExteriorRing(geom)) AS linestring FROM ne_counties WHERE popdata < 50000;"; $res = mysql_query($sql);

<?php include 'mysql_connect.php'; $sql = "SELECT popdata, AsText( ExteriorRing( geom ) ) AS geom FROM ne_counties WHERE Intersects( GeomFromText( 'POINT( )' ), geom ) OR Intersects( GeomFromText( 'POINT( )' ), geom ) OR Intersects( GeomFromText( 'POINT( )' ), geom ) "; $res = mysql_query($sql);